Influence of finite hund rules and charge transfer on properties of haldane systems
We consider the Kondo-Hubbard model with ferromagnetic exchange coupling JH, showing that it is an approximate effective model for late transition-metal–O linear systems. We study the dependence of the charge and spin gaps ΔC,ΔS, and several spin-spin correlation functions, including the hidden orde...
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1999
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v59_n15_p9916_Feiguin http://hdl.handle.net/20.500.12110/paper_10980121_v59_n15_p9916_Feiguin |
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paper:paper_10980121_v59_n15_p9916_Feiguin2023-06-08T16:07:14Z Influence of finite hund rules and charge transfer on properties of haldane systems We consider the Kondo-Hubbard model with ferromagnetic exchange coupling JH, showing that it is an approximate effective model for late transition-metal–O linear systems. We study the dependence of the charge and spin gaps ΔC,ΔS, and several spin-spin correlation functions, including the hidden order parameter Z(π), all properties converge slowly to the strong-coupling limit. When JH/t 2 and U/t 7 (the effective parameters that we obtain for Y2BaNiO5), ΔS is roughly half of the value expected from a strong-coupling expansion. © 1999 The American Physical Society. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v59_n15_p9916_Feiguin http://hdl.handle.net/20.500.12110/paper_10980121_v59_n15_p9916_Feiguin |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
We consider the Kondo-Hubbard model with ferromagnetic exchange coupling JH, showing that it is an approximate effective model for late transition-metal–O linear systems. We study the dependence of the charge and spin gaps ΔC,ΔS, and several spin-spin correlation functions, including the hidden order parameter Z(π), all properties converge slowly to the strong-coupling limit. When JH/t 2 and U/t 7 (the effective parameters that we obtain for Y2BaNiO5), ΔS is roughly half of the value expected from a strong-coupling expansion. © 1999 The American Physical Society. |
| title |
Influence of finite hund rules and charge transfer on properties of haldane systems |
| spellingShingle |
Influence of finite hund rules and charge transfer on properties of haldane systems |
| title_short |
Influence of finite hund rules and charge transfer on properties of haldane systems |
| title_full |
Influence of finite hund rules and charge transfer on properties of haldane systems |
| title_fullStr |
Influence of finite hund rules and charge transfer on properties of haldane systems |
| title_full_unstemmed |
Influence of finite hund rules and charge transfer on properties of haldane systems |
| title_sort |
influence of finite hund rules and charge transfer on properties of haldane systems |
| publishDate |
1999 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v59_n15_p9916_Feiguin http://hdl.handle.net/20.500.12110/paper_10980121_v59_n15_p9916_Feiguin |
| _version_ |
1768543812559306752 |