Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics
Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has b...
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| Autor*in: |
Pashchenko, A. V. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2014 |
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| Schlagwörter: |
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| Anmerkung: |
© Pleiades Publishing, Ltd. 2014 |
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| Übergeordnetes Werk: |
Enthalten in: Physics of the solid state - Pleiades Publishing, 1993, 56(2014), 5 vom: Mai, Seite 955-966 |
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| Übergeordnetes Werk: |
volume:56 ; year:2014 ; number:5 ; month:05 ; pages:955-966 |
| Links: |
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| DOI / URN: |
10.1134/S1063783414050230 |
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| Katalog-ID: |
OLC2040735623 |
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| 245 | 1 | 0 | |a Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics |
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| 520 | |a Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. | ||
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| 700 | 1 | |a Revenko, Yu. F. |4 aut | |
| 700 | 1 | |a Kisel, N. G. |4 aut | |
| 700 | 1 | |a Kamenev, V. I. |4 aut | |
| 700 | 1 | |a Sil’cheva, A. G. |4 aut | |
| 700 | 1 | |a Ledenev, N. A. |4 aut | |
| 700 | 1 | |a Burkhovetskii, V. V. |4 aut | |
| 700 | 1 | |a Levchenko, G. G. |4 aut | |
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10.1134/S1063783414050230 doi (DE-627)OLC2040735623 (DE-He213)S1063783414050230-p DE-627 ger DE-627 rakwb eng 530 VZ Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics 2014 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. Manganite Coercive Force Perovskite Structure Ferromagnetic Phase Anion Vacancy Pashchenko, V. P. aut Prokopenko, V. K. aut Revenko, Yu. F. aut Kisel, N. G. aut Kamenev, V. I. aut Sil’cheva, A. G. aut Ledenev, N. A. aut Burkhovetskii, V. V. aut Levchenko, G. G. aut Enthalten in Physics of the solid state Pleiades Publishing, 1993 56(2014), 5 vom: Mai, Seite 955-966 (DE-627)16567332X (DE-600)1159011-7 (DE-576)038490706 1063-7834 nnns volume:56 year:2014 number:5 month:05 pages:955-966 https://doi.org/10.1134/S1063783414050230 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_70 AR 56 2014 5 05 955-966 |
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10.1134/S1063783414050230 doi (DE-627)OLC2040735623 (DE-He213)S1063783414050230-p DE-627 ger DE-627 rakwb eng 530 VZ Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics 2014 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. Manganite Coercive Force Perovskite Structure Ferromagnetic Phase Anion Vacancy Pashchenko, V. P. aut Prokopenko, V. K. aut Revenko, Yu. F. aut Kisel, N. G. aut Kamenev, V. I. aut Sil’cheva, A. G. aut Ledenev, N. A. aut Burkhovetskii, V. V. aut Levchenko, G. G. aut Enthalten in Physics of the solid state Pleiades Publishing, 1993 56(2014), 5 vom: Mai, Seite 955-966 (DE-627)16567332X (DE-600)1159011-7 (DE-576)038490706 1063-7834 nnns volume:56 year:2014 number:5 month:05 pages:955-966 https://doi.org/10.1134/S1063783414050230 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_70 AR 56 2014 5 05 955-966 |
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10.1134/S1063783414050230 doi (DE-627)OLC2040735623 (DE-He213)S1063783414050230-p DE-627 ger DE-627 rakwb eng 530 VZ Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics 2014 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. Manganite Coercive Force Perovskite Structure Ferromagnetic Phase Anion Vacancy Pashchenko, V. P. aut Prokopenko, V. K. aut Revenko, Yu. F. aut Kisel, N. G. aut Kamenev, V. I. aut Sil’cheva, A. G. aut Ledenev, N. A. aut Burkhovetskii, V. V. aut Levchenko, G. G. aut Enthalten in Physics of the solid state Pleiades Publishing, 1993 56(2014), 5 vom: Mai, Seite 955-966 (DE-627)16567332X (DE-600)1159011-7 (DE-576)038490706 1063-7834 nnns volume:56 year:2014 number:5 month:05 pages:955-966 https://doi.org/10.1134/S1063783414050230 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_70 AR 56 2014 5 05 955-966 |
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10.1134/S1063783414050230 doi (DE-627)OLC2040735623 (DE-He213)S1063783414050230-p DE-627 ger DE-627 rakwb eng 530 VZ Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics 2014 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. Manganite Coercive Force Perovskite Structure Ferromagnetic Phase Anion Vacancy Pashchenko, V. P. aut Prokopenko, V. K. aut Revenko, Yu. F. aut Kisel, N. G. aut Kamenev, V. I. aut Sil’cheva, A. G. aut Ledenev, N. A. aut Burkhovetskii, V. V. aut Levchenko, G. G. aut Enthalten in Physics of the solid state Pleiades Publishing, 1993 56(2014), 5 vom: Mai, Seite 955-966 (DE-627)16567332X (DE-600)1159011-7 (DE-576)038490706 1063-7834 nnns volume:56 year:2014 number:5 month:05 pages:955-966 https://doi.org/10.1134/S1063783414050230 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_70 AR 56 2014 5 05 955-966 |
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10.1134/S1063783414050230 doi (DE-627)OLC2040735623 (DE-He213)S1063783414050230-p DE-627 ger DE-627 rakwb eng 530 VZ Pashchenko, A. V. verfasserin aut Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics 2014 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Pleiades Publishing, Ltd. 2014 Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. Manganite Coercive Force Perovskite Structure Ferromagnetic Phase Anion Vacancy Pashchenko, V. P. aut Prokopenko, V. K. aut Revenko, Yu. F. aut Kisel, N. G. aut Kamenev, V. I. aut Sil’cheva, A. G. aut Ledenev, N. A. aut Burkhovetskii, V. V. aut Levchenko, G. G. aut Enthalten in Physics of the solid state Pleiades Publishing, 1993 56(2014), 5 vom: Mai, Seite 955-966 (DE-627)16567332X (DE-600)1159011-7 (DE-576)038490706 1063-7834 nnns volume:56 year:2014 number:5 month:05 pages:955-966 https://doi.org/10.1134/S1063783414050230 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_70 AR 56 2014 5 05 955-966 |
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Pashchenko, A. V. |
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530 VZ Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics Manganite Coercive Force Perovskite Structure Ferromagnetic Phase Anion Vacancy |
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Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics |
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Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics |
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Pashchenko, A. V. Pashchenko, V. P. Prokopenko, V. K. Revenko, Yu. F. Kisel, N. G. Kamenev, V. I. Sil’cheva, A. G. Ledenev, N. A. Burkhovetskii, V. V. Levchenko, G. G. |
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structural and magnetic inhomogeneities, phase transitions, 55mn nuclear magnetic resonance, and magnetoresistive properties of $ la_{0.6 − x} $$ nd_{x} $$ sr_{0.3} $$ mn_{1.1} $$ o_{3-δ} $ ceramics |
| title_auth |
Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics |
| abstract |
Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. © Pleiades Publishing, Ltd. 2014 |
| abstractGer |
Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. © Pleiades Publishing, Ltd. 2014 |
| abstract_unstemmed |
Abstract The structure, lattice imperfection, and properties of ceramic samples $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ (x = 0–0.4) have been investigated using the X-ray diffraction, resistive, magnetic ($ χ_{ac} $, 55Mn NMR), magnetoresistive and microscopic methods. It has been shown that there is a satisfactory agreement between the concentration decrease in the lattice parameters a of the rhombohedral (x = 0, 0.1, 0.2) and cubic (x = 0.3, 0.4) perovskite structures and the average ionic radii $$\bar R$$ for the lattice containing anion vacancies, cation vacancies, and nanostructured clusters with $ Mn^{2+} $ ions in A-positions. With an increase in the neodymium concentration x, the vacancy-type imperfection increases, the cluster-type imperfection decreases, the temperatures of metal-semiconductor phase transition Tms and ferromagnetic-paramagnetic phase transition TC decrease, and the content of the ferromagnetic phase decreases. The anomalous hysteresis is associated with the appearance of unidirectional exchange anisotropy induced in a clustered perovskite structure consisting of a ferromagnetic matrix and a planar antiferromagnetic cluster coherently coupled with it. An analysis of the asymmetrically broadened 55Mn NMR spectra has revealed a high-frequency electronic double exchange ($ Mn^{3+} $-$ O^{2−} $-$ Mn^{4+} $) ↔ ($ Mn^{4+} $-$ O^{2−} $-$ Mn^{3+} $) and an inhomogeneity of the magnetic and charge states of manganese due to the heterogeneous environment of the manganese ions by other ions and defects. The observed changes in the resonant frequency and width of the resonance curve are caused by changes in the ratio $ Mn^{3+} $/$ Mn^{4+} $ and magnetic inhomogeneity. An increase in the neodymium concentration x leads to a decrease in the ferromagnetic phase content determined from the dependences 4πN$ χ_{ac} $(T) and the 55Mn NMR curves. The phase diagram characterizes an interrelation between the composition, the imperfection of the structure, and the transport, magnetic, and magnetoresistive properties of lanthanum neodymium manganite perovskites. It has been found that there is a correlation between the imperfection, magnetic inhomogeneity, coercive force, and magnetoresistance effect exhibited by the perovskite structure. © Pleiades Publishing, Ltd. 2014 |
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Structural and magnetic inhomogeneities, phase transitions, 55Mn nuclear magnetic resonance, and magnetoresistive properties of $ La_{0.6 − x} $$ Nd_{x} $$ Sr_{0.3} $$ Mn_{1.1} $$ O_{3-δ} $ ceramics |
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Pashchenko, V. P. Prokopenko, V. K. Revenko, Yu. F. Kisel, N. G. Kamenev, V. I. Sil’cheva, A. G. Ledenev, N. A. Burkhovetskii, V. V. Levchenko, G. G. |
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