Effects of antisymmetric interactions in molecular iron rings
Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at...
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| Autor*in: |
Cinti, F. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2002 |
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| Systematik: |
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| Anmerkung: |
© EDP Sciences, Springer-Verlag 2002 |
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| Übergeordnetes Werk: |
Enthalten in: The European physical journal / B - EDP Sciences, Springer-Verlag, 1998, 30(2002), 4 vom: Dez., Seite 461-468 |
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| Übergeordnetes Werk: |
volume:30 ; year:2002 ; number:4 ; month:12 ; pages:461-468 |
| Links: |
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| DOI / URN: |
10.1140/epjb/e2002-00402-8 |
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OLC2065641029 |
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| 520 | |a Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. | ||
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10.1140/epjb/e2002-00402-8 doi (DE-627)OLC2065641029 (DE-He213)e2002-00402-8-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ UA 3858.B VZ rvk Cinti, F. verfasserin aut Effects of antisymmetric interactions in molecular iron rings 2002 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © EDP Sciences, Springer-Verlag 2002 Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. Affronte, M. aut Jansen, A.G.M. aut Enthalten in The European physical journal / B EDP Sciences, Springer-Verlag, 1998 30(2002), 4 vom: Dez., Seite 461-468 (DE-627)235469769 (DE-600)1397768-4 (DE-576)061879142 1434-6028 nnns volume:30 year:2002 number:4 month:12 pages:461-468 https://doi.org/10.1140/epjb/e2002-00402-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_120 GBV_ILN_130 GBV_ILN_170 GBV_ILN_267 GBV_ILN_2005 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2185 GBV_ILN_2192 GBV_ILN_2221 GBV_ILN_2409 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4126 GBV_ILN_4277 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4700 UA 3858.B AR 30 2002 4 12 461-468 |
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10.1140/epjb/e2002-00402-8 doi (DE-627)OLC2065641029 (DE-He213)e2002-00402-8-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ UA 3858.B VZ rvk Cinti, F. verfasserin aut Effects of antisymmetric interactions in molecular iron rings 2002 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © EDP Sciences, Springer-Verlag 2002 Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. Affronte, M. aut Jansen, A.G.M. aut Enthalten in The European physical journal / B EDP Sciences, Springer-Verlag, 1998 30(2002), 4 vom: Dez., Seite 461-468 (DE-627)235469769 (DE-600)1397768-4 (DE-576)061879142 1434-6028 nnns volume:30 year:2002 number:4 month:12 pages:461-468 https://doi.org/10.1140/epjb/e2002-00402-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_120 GBV_ILN_130 GBV_ILN_170 GBV_ILN_267 GBV_ILN_2005 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2185 GBV_ILN_2192 GBV_ILN_2221 GBV_ILN_2409 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4126 GBV_ILN_4277 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4700 UA 3858.B AR 30 2002 4 12 461-468 |
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10.1140/epjb/e2002-00402-8 doi (DE-627)OLC2065641029 (DE-He213)e2002-00402-8-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ UA 3858.B VZ rvk Cinti, F. verfasserin aut Effects of antisymmetric interactions in molecular iron rings 2002 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © EDP Sciences, Springer-Verlag 2002 Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. Affronte, M. aut Jansen, A.G.M. aut Enthalten in The European physical journal / B EDP Sciences, Springer-Verlag, 1998 30(2002), 4 vom: Dez., Seite 461-468 (DE-627)235469769 (DE-600)1397768-4 (DE-576)061879142 1434-6028 nnns volume:30 year:2002 number:4 month:12 pages:461-468 https://doi.org/10.1140/epjb/e2002-00402-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_120 GBV_ILN_130 GBV_ILN_170 GBV_ILN_267 GBV_ILN_2005 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2185 GBV_ILN_2192 GBV_ILN_2221 GBV_ILN_2409 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4126 GBV_ILN_4277 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4700 UA 3858.B AR 30 2002 4 12 461-468 |
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10.1140/epjb/e2002-00402-8 doi (DE-627)OLC2065641029 (DE-He213)e2002-00402-8-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ UA 3858.B VZ rvk Cinti, F. verfasserin aut Effects of antisymmetric interactions in molecular iron rings 2002 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © EDP Sciences, Springer-Verlag 2002 Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. Affronte, M. aut Jansen, A.G.M. aut Enthalten in The European physical journal / B EDP Sciences, Springer-Verlag, 1998 30(2002), 4 vom: Dez., Seite 461-468 (DE-627)235469769 (DE-600)1397768-4 (DE-576)061879142 1434-6028 nnns volume:30 year:2002 number:4 month:12 pages:461-468 https://doi.org/10.1140/epjb/e2002-00402-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_120 GBV_ILN_130 GBV_ILN_170 GBV_ILN_267 GBV_ILN_2005 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2185 GBV_ILN_2192 GBV_ILN_2221 GBV_ILN_2409 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4126 GBV_ILN_4277 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4700 UA 3858.B AR 30 2002 4 12 461-468 |
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10.1140/epjb/e2002-00402-8 doi (DE-627)OLC2065641029 (DE-He213)e2002-00402-8-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ UA 3858.B VZ rvk Cinti, F. verfasserin aut Effects of antisymmetric interactions in molecular iron rings 2002 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © EDP Sciences, Springer-Verlag 2002 Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. Affronte, M. aut Jansen, A.G.M. aut Enthalten in The European physical journal / B EDP Sciences, Springer-Verlag, 1998 30(2002), 4 vom: Dez., Seite 461-468 (DE-627)235469769 (DE-600)1397768-4 (DE-576)061879142 1434-6028 nnns volume:30 year:2002 number:4 month:12 pages:461-468 https://doi.org/10.1140/epjb/e2002-00402-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_120 GBV_ILN_130 GBV_ILN_170 GBV_ILN_267 GBV_ILN_2005 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2185 GBV_ILN_2192 GBV_ILN_2221 GBV_ILN_2409 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4126 GBV_ILN_4277 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4700 UA 3858.B AR 30 2002 4 12 461-468 |
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Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. © EDP Sciences, Springer-Verlag 2002 |
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Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. © EDP Sciences, Springer-Verlag 2002 |
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Abstract: The level crossing mechanism between the ground and the first excited state of Na:$ Fe_{6} $ antiferromagnetically coupled iron rings is studied by torque magnetometry down to 40 mK and in magnetic fields up to 28 T. The step width at the crossing field $ B_{c} $ assumes a finite value at the lowest temperatures. This fact is ascribed to the presence of level anticrossing, not expected for a ring with axial, i.e. $ S_{6} $ point group, symmetry. Assuming a reduced symmetry, we revised the model Hamiltonian of such a spin system by introducing a Dzyaloshinsky-Moriya (DM) term and we show, by exact diagonalization, that DM term can account for the mixing of states with different parity. In particular, analytical as well numerical analysis show that the introduction of the DM term may contribute to the broadening of the torque step as well as for the finite energy gap at $ B_{c} $ observed by heat capacity in a similar ring Li:$ Fe_{6} $ as previously reported [#!aclbg!#]. © EDP Sciences, Springer-Verlag 2002 |
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