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EnglishWe present exact results for a diatomic molecule described by the Ansderson model which includes both on-site and intersite hybridization, as well as the on-site Coulomb repulsion between f- and conduction electrons (the Falicov-Kimball term). The mixed valence behaviour is demonstrated in the subspace with N = 2 electrons, while the competition between Kondo screening and RKKY interaction is investigated for N = 4 electrons. The Falicov-Kimball term restricts the range of stability of the mixed valence state, and increases the values of the Kondo temperature and of the crossover temperature to disordered f-moments in the Kondo and RKKY regime, respectively, while it increases the temperature above which the ferromagnetic correlations between f-moments are destabilized for N = 3 electrons. © 1995.
| Titolo: | A molecular model for strongly correlated electron systems |
| Autori: | |
| Data di pubblicazione: | 1995 |
| Rivista: | |
| Abstract: | We present exact results for a diatomic molecule described by the Ansderson model which includes both on-site and intersite hybridization, as well as the on-site Coulomb repulsion between f- and conduction electrons (the Falicov-Kimball term). The mixed valence behaviour is demonstrated in the subspace with N = 2 electrons, while the competition between Kondo screening and RKKY interaction is investigated for N = 4 electrons. The Falicov-Kimball term restricts the range of stability of the mixed valence state, and increases the values of the Kondo temperature and of the crossover temperature to disordered f-moments in the Kondo and RKKY regime, respectively, while it increases the temperature above which the ferromagnetic correlations between f-moments are destabilized for N = 3 electrons. © 1995. |
| Handle: | http://hdl.handle.net/11591/183776 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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