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|Type:||Artigo de periódico|
|Title:||Study of the Kondo and high-temperature limits of the slave-boson and X-boson methods|
|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.|
periodic Anderson model
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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