Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/75333
Type: Artigo de periódico
Title: Study of the Kondo and high-temperature limits of the slave-boson and X-boson methods
Author: Nunes, LHCM
Figueira, MS
Foglio, ME
Abstract: In this Letter we study the periodic Anderson model, employing both the slave-boson and the X-boson approaches in the mean field approximation. We investigate the breakdown of the slave-boson at intermediate temperatures when the total occupation number of particles N(t) = N(f) + N(c) is keep constant, where N(f) and N(c) are respectively the occupation numbers of the localized and conduction electrons, and we show that the high-temperature limit of the slave-boson is N(f) = N(c) = N(t)/2. We also compare the results of the two approaches in the Kondo limit and we show that at low-temperatures the X-boson exhibits a phase transition, from the Kondo heavy fermion (K-HF) regime to a local moment magnetic regime (LMM). (c) 2006 Elsevier B.V. All rights reserved.
Subject: slave-boson
Kondo effect
periodic Anderson model
X-boson
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.physleta.2006.05.025
Date Issue: 2006
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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