Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/95020
Type: Artigo de periódico
Title: X-slave Boson Approach To The Periodic Anderson Model
Author: Franco R.
Figueira M.S.
Foglio M.E.
Abstract: The periodic anderson model (PAM) in the limit U = ∞, can be studied by employing the Hubbard X operators to project out the unwanted states. In a previous work, we have studied the cumulant expansion of this Hamiltonian employing the hybridization as a perturbation, but probability conservation of the local states (completeness) is not usually satisfied when partial expansions like the "chain approximation (CHA)́ are employed. To consider this problem, we use a technique similar to the one employed by Coleman to treat the same problem with slave-bosons in the mean-field approximation. Assuming a particular renormalization for hybridization, we obtain a description that avoids an unwanted phase transition that appears in the mean-field slave-boson method at intermediate temperatures. © 2001 Elsevier Science B.V. All rights reserved.
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0035326899&partnerID=40&md5=1b5ea133eca9afa2cfef4ea3166201bc
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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