Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics
Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magneti...
Ausführliche Beschreibung
Autor*in: |
Pashchenko, A. V. [verfasserIn] Pashchenko, V. P. [verfasserIn] Prokopenko, V. K. [verfasserIn] Revenko, Yu. F. [verfasserIn] Mazur, A. S. [verfasserIn] Sycheva, V. Ya. [verfasserIn] Burkhovetskii, V. V. [verfasserIn] Kisel’, N. G. [verfasserIn] Komarov, V. P. [verfasserIn] Sil’cheva, A. G. [verfasserIn] |
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Sprache: |
Englisch |
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2013 |
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Übergeordnetes Werk: |
Enthalten in: Physics of the solid state - College Park, Md. : Inst., 1997, 55(2013), 6 vom: Juni, Seite 1159-1169 |
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Übergeordnetes Werk: |
volume:55 ; year:2013 ; number:6 ; month:06 ; pages:1159-1169 |
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DOI / URN: |
10.1134/S1063783413060280 |
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Katalog-ID: |
SPR019664346 |
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245 | 1 | 0 | |a Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics |
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520 | |a Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. | ||
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700 | 1 | |a Pashchenko, V. P. |e verfasserin |4 aut | |
700 | 1 | |a Prokopenko, V. K. |e verfasserin |4 aut | |
700 | 1 | |a Revenko, Yu. F. |e verfasserin |4 aut | |
700 | 1 | |a Mazur, A. S. |e verfasserin |4 aut | |
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700 | 1 | |a Kisel’, N. G. |e verfasserin |4 aut | |
700 | 1 | |a Komarov, V. P. |e verfasserin |4 aut | |
700 | 1 | |a Sil’cheva, A. G. |e verfasserin |4 aut | |
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10.1134/S1063783413060280 doi (DE-627)SPR019664346 (SPR)S1063783413060280-e DE-627 ger DE-627 rakwb eng 530 ASE 33.60 bkl Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. Manganite (dpeaa)DE-He213 Magnetic Inhomogeneity (dpeaa)DE-He213 Lanthanum Strontium Manganite (dpeaa)DE-He213 Average Ionic Radius (dpeaa)DE-He213 Rare Earth Manganite (dpeaa)DE-He213 Pashchenko, V. P. verfasserin aut Prokopenko, V. K. verfasserin aut Revenko, Yu. F. verfasserin aut Mazur, A. S. verfasserin aut Sycheva, V. Ya. verfasserin aut Burkhovetskii, V. V. verfasserin aut Kisel’, N. G. verfasserin aut Komarov, V. P. verfasserin aut Sil’cheva, A. G. verfasserin aut Enthalten in Physics of the solid state College Park, Md. : Inst., 1997 55(2013), 6 vom: Juni, Seite 1159-1169 (DE-627)269017275 (DE-600)1473624-X 1090-6460 nnns volume:55 year:2013 number:6 month:06 pages:1159-1169 https://dx.doi.org/10.1134/S1063783413060280 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 33.60 ASE AR 55 2013 6 06 1159-1169 |
spelling |
10.1134/S1063783413060280 doi (DE-627)SPR019664346 (SPR)S1063783413060280-e DE-627 ger DE-627 rakwb eng 530 ASE 33.60 bkl Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. Manganite (dpeaa)DE-He213 Magnetic Inhomogeneity (dpeaa)DE-He213 Lanthanum Strontium Manganite (dpeaa)DE-He213 Average Ionic Radius (dpeaa)DE-He213 Rare Earth Manganite (dpeaa)DE-He213 Pashchenko, V. P. verfasserin aut Prokopenko, V. K. verfasserin aut Revenko, Yu. F. verfasserin aut Mazur, A. S. verfasserin aut Sycheva, V. Ya. verfasserin aut Burkhovetskii, V. V. verfasserin aut Kisel’, N. G. verfasserin aut Komarov, V. P. verfasserin aut Sil’cheva, A. G. verfasserin aut Enthalten in Physics of the solid state College Park, Md. : Inst., 1997 55(2013), 6 vom: Juni, Seite 1159-1169 (DE-627)269017275 (DE-600)1473624-X 1090-6460 nnns volume:55 year:2013 number:6 month:06 pages:1159-1169 https://dx.doi.org/10.1134/S1063783413060280 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 33.60 ASE AR 55 2013 6 06 1159-1169 |
allfields_unstemmed |
10.1134/S1063783413060280 doi (DE-627)SPR019664346 (SPR)S1063783413060280-e DE-627 ger DE-627 rakwb eng 530 ASE 33.60 bkl Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. Manganite (dpeaa)DE-He213 Magnetic Inhomogeneity (dpeaa)DE-He213 Lanthanum Strontium Manganite (dpeaa)DE-He213 Average Ionic Radius (dpeaa)DE-He213 Rare Earth Manganite (dpeaa)DE-He213 Pashchenko, V. P. verfasserin aut Prokopenko, V. K. verfasserin aut Revenko, Yu. F. verfasserin aut Mazur, A. S. verfasserin aut Sycheva, V. Ya. verfasserin aut Burkhovetskii, V. V. verfasserin aut Kisel’, N. G. verfasserin aut Komarov, V. P. verfasserin aut Sil’cheva, A. G. verfasserin aut Enthalten in Physics of the solid state College Park, Md. : Inst., 1997 55(2013), 6 vom: Juni, Seite 1159-1169 (DE-627)269017275 (DE-600)1473624-X 1090-6460 nnns volume:55 year:2013 number:6 month:06 pages:1159-1169 https://dx.doi.org/10.1134/S1063783413060280 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 33.60 ASE AR 55 2013 6 06 1159-1169 |
allfieldsGer |
10.1134/S1063783413060280 doi (DE-627)SPR019664346 (SPR)S1063783413060280-e DE-627 ger DE-627 rakwb eng 530 ASE 33.60 bkl Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. Manganite (dpeaa)DE-He213 Magnetic Inhomogeneity (dpeaa)DE-He213 Lanthanum Strontium Manganite (dpeaa)DE-He213 Average Ionic Radius (dpeaa)DE-He213 Rare Earth Manganite (dpeaa)DE-He213 Pashchenko, V. P. verfasserin aut Prokopenko, V. K. verfasserin aut Revenko, Yu. F. verfasserin aut Mazur, A. S. verfasserin aut Sycheva, V. Ya. verfasserin aut Burkhovetskii, V. V. verfasserin aut Kisel’, N. G. verfasserin aut Komarov, V. P. verfasserin aut Sil’cheva, A. G. verfasserin aut Enthalten in Physics of the solid state College Park, Md. : Inst., 1997 55(2013), 6 vom: Juni, Seite 1159-1169 (DE-627)269017275 (DE-600)1473624-X 1090-6460 nnns volume:55 year:2013 number:6 month:06 pages:1159-1169 https://dx.doi.org/10.1134/S1063783413060280 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 33.60 ASE AR 55 2013 6 06 1159-1169 |
allfieldsSound |
10.1134/S1063783413060280 doi (DE-627)SPR019664346 (SPR)S1063783413060280-e DE-627 ger DE-627 rakwb eng 530 ASE 33.60 bkl Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics 2013 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. Manganite (dpeaa)DE-He213 Magnetic Inhomogeneity (dpeaa)DE-He213 Lanthanum Strontium Manganite (dpeaa)DE-He213 Average Ionic Radius (dpeaa)DE-He213 Rare Earth Manganite (dpeaa)DE-He213 Pashchenko, V. P. verfasserin aut Prokopenko, V. K. verfasserin aut Revenko, Yu. F. verfasserin aut Mazur, A. S. verfasserin aut Sycheva, V. Ya. verfasserin aut Burkhovetskii, V. V. verfasserin aut Kisel’, N. G. verfasserin aut Komarov, V. P. verfasserin aut Sil’cheva, A. G. verfasserin aut Enthalten in Physics of the solid state College Park, Md. : Inst., 1997 55(2013), 6 vom: Juni, Seite 1159-1169 (DE-627)269017275 (DE-600)1473624-X 1090-6460 nnns volume:55 year:2013 number:6 month:06 pages:1159-1169 https://dx.doi.org/10.1134/S1063783413060280 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 33.60 ASE AR 55 2013 6 06 1159-1169 |
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Enthalten in Physics of the solid state 55(2013), 6 vom: Juni, Seite 1159-1169 volume:55 year:2013 number:6 month:06 pages:1159-1169 |
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Pashchenko, A. V. @@aut@@ Pashchenko, V. P. @@aut@@ Prokopenko, V. K. @@aut@@ Revenko, Yu. F. @@aut@@ Mazur, A. S. @@aut@@ Sycheva, V. Ya. @@aut@@ Burkhovetskii, V. V. @@aut@@ Kisel’, N. G. @@aut@@ Komarov, V. P. @@aut@@ Sil’cheva, A. G. @@aut@@ |
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V.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2013</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. 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|
author |
Pashchenko, A. V. |
spellingShingle |
Pashchenko, A. V. ddc 530 bkl 33.60 misc Manganite misc Magnetic Inhomogeneity misc Lanthanum Strontium Manganite misc Average Ionic Radius misc Rare Earth Manganite Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics |
authorStr |
Pashchenko, A. V. |
ppnlink_with_tag_str_mv |
@@773@@(DE-627)269017275 |
format |
electronic Article |
dewey-ones |
530 - Physics |
delete_txt_mv |
keep |
author_role |
aut aut aut aut aut aut aut aut aut aut |
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springer |
remote_str |
true |
illustrated |
Not Illustrated |
issn |
1090-6460 |
topic_title |
530 ASE 33.60 bkl Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics Manganite (dpeaa)DE-He213 Magnetic Inhomogeneity (dpeaa)DE-He213 Lanthanum Strontium Manganite (dpeaa)DE-He213 Average Ionic Radius (dpeaa)DE-He213 Rare Earth Manganite (dpeaa)DE-He213 |
topic |
ddc 530 bkl 33.60 misc Manganite misc Magnetic Inhomogeneity misc Lanthanum Strontium Manganite misc Average Ionic Radius misc Rare Earth Manganite |
topic_unstemmed |
ddc 530 bkl 33.60 misc Manganite misc Magnetic Inhomogeneity misc Lanthanum Strontium Manganite misc Average Ionic Radius misc Rare Earth Manganite |
topic_browse |
ddc 530 bkl 33.60 misc Manganite misc Magnetic Inhomogeneity misc Lanthanum Strontium Manganite misc Average Ionic Radius misc Rare Earth Manganite |
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Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics |
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Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics |
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Pashchenko, A. V. |
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Physics of the solid state |
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Pashchenko, A. V. Pashchenko, V. P. Prokopenko, V. K. Revenko, Yu. F. Mazur, A. S. Sycheva, V. Ya. Burkhovetskii, V. V. Kisel’, N. G. Komarov, V. P. Sil’cheva, A. G. |
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Pashchenko, A. V. |
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10.1134/S1063783413060280 |
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structural and magnetic inhomogeneities, phase transitions, 55mn nmr, and magnetoresistive properties of $ la_{0.6} %$ sr_{0.2} %$ mn_{1.2 − x} %$ nb_{x} %$ o_{3} $ ceramics |
title_auth |
Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics |
abstract |
Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. |
abstractGer |
Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. |
abstract_unstemmed |
Abstract Ceramic samples of lanthanum strontium manganite perovskites $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ (x = 0–0.3) annealed at temperatures of 1260 and 1500°C have been investigated using the X-ray diffraction, electron microscopic, resistive, magnetoresistive, and magnetic ($ χ_{ac} $, 55Mn NMR) methods. It has been found that there is a correlation between the increasing unit cell parameter a of the rhombohedral R$\bar 3$c structure and the average ionic radius with increasing niobium concentration x and annealing temperature for the case where the lattice contains anion vacancies, cation vacancies, and nanostructured clusters. The observed increase in the electrical resistivity and decrease in the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC with an increase in the niobium concentration x and the annealing temperature have been explained by the decrease in the content of the ferromagnetic phase, as well as by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $, the oxygen nonstoichiometry, and the concentration of defects weakening the high-frequency electronic exchange of the ions $ Mn^{3+} $ ↔ $ Mn^{4+} $. The presence of nanostructured clusters in the lattice has been confirmed by an anomalous hysteresis associated with the unidirectional exchange anisotropy of the interaction between the ferromagnetic matrix and antiferromagnetic clusters with $ Mn^{2+} $ and $ Nb^{3+} $ in distorted A-positions. An analysis of the asymmetrically broadened 55Mn NMR spectra and their computer decomposition have revealed a high-frequency electronic exchange and an inhomogeneity of the magnetic and valence states of manganese due to the nonuniform distribution of all ions and defects. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures TC and Tms, is caused by scattering at intracrystalline nanostructured heterogeneities of the imperfect perovskite structure, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between the composition, structure, resistive and magnetic properties of rare-earth manganites. |
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Structural and magnetic inhomogeneities, phase transitions, 55Mn NMR, and magnetoresistive properties of $ La_{0.6} %$ Sr_{0.2} %$ Mn_{1.2 − x} %$ Nb_{x} %$ O_{3} $ ceramics |
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Pashchenko, V. P. Prokopenko, V. K. Revenko, Yu. F. Mazur, A. S. Sycheva, V. Ya Burkhovetskii, V. V. Kisel’, N. G. Komarov, V. P. Sil’cheva, A. G. |
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score |
7.3996534 |