A new approach for the RFK model

We have studied the Ramirez-Falicov and Kimball (RFK) model for the intermediate valence problem, including a non-zero width ZW for the conduction band; a finite Coulomb repulsion between f electrons: U; and treated the inter-band Coulomb interaction G into an approach Hubbard I - style. We found th...

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Bibliographic Details
Published in:Physica B + C 1981, Vol.108 (1), p.1357-1358
Main Authors: Porras Montenegro, N., Iglesias-Sicardi, J.R.
Format: Article
Language:English
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Summary:We have studied the Ramirez-Falicov and Kimball (RFK) model for the intermediate valence problem, including a non-zero width ZW for the conduction band; a finite Coulomb repulsion between f electrons: U; and treated the inter-band Coulomb interaction G into an approach Hubbard I - style. We found that it is possible to obtain an abrupt valence transition for finite U, but not in the limit U → ∞. This discontinuous transition does not originate a fractionary occupancy of the f-level although an hybridization between f- and conductions electrons is included.
ISSN:0378-4363
DOI:10.1016/0378-4363(81)90977-3