Effect of band filling in the Kondo lattice : a mean-field approach

Detalhes bibliográficos
Autor(a) principal: Ruppenthal, Alaor Ricardo
Data de Publicação: 1999
Outros Autores: Iglesias, Jose Roberto, Gusmao, Miguel Angelo Cavalheiro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/104292
Resumo: The usual Kondo lattice, including an antiferromagnetic exchange interaction between nearest-neighboring localized spins, is treated here in a mean-field scheme that introduces two mean-field parameters: one associated with the local Kondo effect, and the other related to the magnetic correlations between localized spins. Phases with short-range magnetic correlations or coexistence between those and the Kondo effect are obtained. By varying the number of electrons in the conduction band, we notice that the Kondo effect tends to be suppressed away from half filling, while magnetic correlations can survive if the Heisenberg coupling is strong enough. An enhanced linear coefficient of the specific heat is obtained at low temperatures in the metallic state.
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spelling Ruppenthal, Alaor RicardoIglesias, Jose RobertoGusmao, Miguel Angelo Cavalheiro2014-10-09T02:12:48Z19991098-0121http://hdl.handle.net/10183/104292000269715The usual Kondo lattice, including an antiferromagnetic exchange interaction between nearest-neighboring localized spins, is treated here in a mean-field scheme that introduces two mean-field parameters: one associated with the local Kondo effect, and the other related to the magnetic correlations between localized spins. Phases with short-range magnetic correlations or coexistence between those and the Kondo effect are obtained. By varying the number of electrons in the conduction band, we notice that the Kondo effect tends to be suppressed away from half filling, while magnetic correlations can survive if the Heisenberg coupling is strong enough. An enhanced linear coefficient of the specific heat is obtained at low temperatures in the metallic state.application/pdfengPhysical review. B, Condensed matter and materials physics. New York. Vol. 60, no. 10 (Sept. 1999), p. 7321-7327Fisica teorica da materia condensadaEfeito kondoAntiferromagnetismoModelo de heisenbergMagnetismoSistemas eletronicos fortemente correlacionadosEffect of band filling in the Kondo lattice : a mean-field approachEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000269715.pdf000269715.pdfTexto completo (inglês)application/pdf95112http://www.lume.ufrgs.br/bitstream/10183/104292/1/000269715.pdf4bc2bd54e29121c8e73c3a65f07a879aMD51TEXT000269715.pdf.txt000269715.pdf.txtExtracted Texttext/plain27783http://www.lume.ufrgs.br/bitstream/10183/104292/2/000269715.pdf.txt52c170166b2f9a04a8197ce808435750MD52THUMBNAIL000269715.pdf.jpg000269715.pdf.jpgGenerated Thumbnailimage/jpeg1984http://www.lume.ufrgs.br/bitstream/10183/104292/3/000269715.pdf.jpg745fd20c2b93a95288a6b290bda09218MD5310183/1042922018-10-09 08:12:01.382oai:www.lume.ufrgs.br:10183/104292Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-09T11:12:01Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Effect of band filling in the Kondo lattice : a mean-field approach
title Effect of band filling in the Kondo lattice : a mean-field approach
spellingShingle Effect of band filling in the Kondo lattice : a mean-field approach
Ruppenthal, Alaor Ricardo
Fisica teorica da materia condensada
Efeito kondo
Antiferromagnetismo
Modelo de heisenberg
Magnetismo
Sistemas eletronicos fortemente correlacionados
title_short Effect of band filling in the Kondo lattice : a mean-field approach
title_full Effect of band filling in the Kondo lattice : a mean-field approach
title_fullStr Effect of band filling in the Kondo lattice : a mean-field approach
title_full_unstemmed Effect of band filling in the Kondo lattice : a mean-field approach
title_sort Effect of band filling in the Kondo lattice : a mean-field approach
author Ruppenthal, Alaor Ricardo
author_facet Ruppenthal, Alaor Ricardo
Iglesias, Jose Roberto
Gusmao, Miguel Angelo Cavalheiro
author_role author
author2 Iglesias, Jose Roberto
Gusmao, Miguel Angelo Cavalheiro
author2_role author
author
dc.contributor.author.fl_str_mv Ruppenthal, Alaor Ricardo
Iglesias, Jose Roberto
Gusmao, Miguel Angelo Cavalheiro
dc.subject.por.fl_str_mv Fisica teorica da materia condensada
Efeito kondo
Antiferromagnetismo
Modelo de heisenberg
Magnetismo
Sistemas eletronicos fortemente correlacionados
topic Fisica teorica da materia condensada
Efeito kondo
Antiferromagnetismo
Modelo de heisenberg
Magnetismo
Sistemas eletronicos fortemente correlacionados
description The usual Kondo lattice, including an antiferromagnetic exchange interaction between nearest-neighboring localized spins, is treated here in a mean-field scheme that introduces two mean-field parameters: one associated with the local Kondo effect, and the other related to the magnetic correlations between localized spins. Phases with short-range magnetic correlations or coexistence between those and the Kondo effect are obtained. By varying the number of electrons in the conduction band, we notice that the Kondo effect tends to be suppressed away from half filling, while magnetic correlations can survive if the Heisenberg coupling is strong enough. An enhanced linear coefficient of the specific heat is obtained at low temperatures in the metallic state.
publishDate 1999
dc.date.issued.fl_str_mv 1999
dc.date.accessioned.fl_str_mv 2014-10-09T02:12:48Z
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/104292
dc.identifier.issn.pt_BR.fl_str_mv 1098-0121
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Physical review. B, Condensed matter and materials physics. New York. Vol. 60, no. 10 (Sept. 1999), p. 7321-7327
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