Application of the underscreened Kondo lattice model to neptunium compounds
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/109913 |
Resumo: | The coexistence of Kondo e®ect and ferromagnetic order has been observed in many uranium and neptunium compounds such as UTe or Np2PdGa3. This coexistence can be described within the underscreened Anderson lattice model with two f-electrons and S = 1 spins on each site. After performing the Schrie®er-Wol® transformation on this model, we have obtained an e®ective Hamiltonian with a f-band term in addition to the Kondo interaction for S = 1 spins. The results indicate a coexistence of Kondo e®ect and ferromagnetic order, with di®erent relative values of the Kondo TK and Curie TC temperatures. We emphasize here especially the case TK < TC where there is a Kondo behavior below TC and a clear decrease of the magnetization below TK. Such a behavior has been observed in the magnetization curves of NpNiSi2 at low temperatures. |
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Thomas, ChristopherSimões, Acirete Souza da RosaIglesias, Jose RobertoLacroix, ClaudineCoqblin, Bernard2015-02-10T02:17:35Z20121742-6588http://hdl.handle.net/10183/109913000900441The coexistence of Kondo e®ect and ferromagnetic order has been observed in many uranium and neptunium compounds such as UTe or Np2PdGa3. This coexistence can be described within the underscreened Anderson lattice model with two f-electrons and S = 1 spins on each site. After performing the Schrie®er-Wol® transformation on this model, we have obtained an e®ective Hamiltonian with a f-band term in addition to the Kondo interaction for S = 1 spins. The results indicate a coexistence of Kondo e®ect and ferromagnetic order, with di®erent relative values of the Kondo TK and Curie TC temperatures. We emphasize here especially the case TK < TC where there is a Kondo behavior below TC and a clear decrease of the magnetization below TK. Such a behavior has been observed in the magnetization curves of NpNiSi2 at low temperatures.application/pdfengJournal of physics : conference series. Bristol. Vol. 391 (2012), 012174, 5 p.Modelo de AndersonTemperatura de curieMateriais ferromagnéticosEfeito kondoMagnetizaçãoCompostos de netúnioCompostos de níquelApplication of the underscreened Kondo lattice model to neptunium compoundsEstrangeiroinfo: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:UFRGSORIGINAL000900441.pdf000900441.pdfTexto completo (inglês)application/pdf486626http://www.lume.ufrgs.br/bitstream/10183/109913/1/000900441.pdf6ca0e48d8c1f27ce2bd0a7b095d0b9a4MD51TEXT000900441.pdf.txt000900441.pdf.txtExtracted Texttext/plain15364http://www.lume.ufrgs.br/bitstream/10183/109913/2/000900441.pdf.txt46bf9c4c74a31a9aa3b307c481379129MD52THUMBNAIL000900441.pdf.jpg000900441.pdf.jpgGenerated Thumbnailimage/jpeg1167http://www.lume.ufrgs.br/bitstream/10183/109913/3/000900441.pdf.jpgba8f971979726c84f371d05e74f9019fMD5310183/1099132023-05-14 03:24:52.312158oai:www.lume.ufrgs.br:10183/109913Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:24:52Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Application of the underscreened Kondo lattice model to neptunium compounds |
title |
Application of the underscreened Kondo lattice model to neptunium compounds |
spellingShingle |
Application of the underscreened Kondo lattice model to neptunium compounds Thomas, Christopher Modelo de Anderson Temperatura de curie Materiais ferromagnéticos Efeito kondo Magnetização Compostos de netúnio Compostos de níquel |
title_short |
Application of the underscreened Kondo lattice model to neptunium compounds |
title_full |
Application of the underscreened Kondo lattice model to neptunium compounds |
title_fullStr |
Application of the underscreened Kondo lattice model to neptunium compounds |
title_full_unstemmed |
Application of the underscreened Kondo lattice model to neptunium compounds |
title_sort |
Application of the underscreened Kondo lattice model to neptunium compounds |
author |
Thomas, Christopher |
author_facet |
Thomas, Christopher Simões, Acirete Souza da Rosa Iglesias, Jose Roberto Lacroix, Claudine Coqblin, Bernard |
author_role |
author |
author2 |
Simões, Acirete Souza da Rosa Iglesias, Jose Roberto Lacroix, Claudine Coqblin, Bernard |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Thomas, Christopher Simões, Acirete Souza da Rosa Iglesias, Jose Roberto Lacroix, Claudine Coqblin, Bernard |
dc.subject.por.fl_str_mv |
Modelo de Anderson Temperatura de curie Materiais ferromagnéticos Efeito kondo Magnetização Compostos de netúnio Compostos de níquel |
topic |
Modelo de Anderson Temperatura de curie Materiais ferromagnéticos Efeito kondo Magnetização Compostos de netúnio Compostos de níquel |
description |
The coexistence of Kondo e®ect and ferromagnetic order has been observed in many uranium and neptunium compounds such as UTe or Np2PdGa3. This coexistence can be described within the underscreened Anderson lattice model with two f-electrons and S = 1 spins on each site. After performing the Schrie®er-Wol® transformation on this model, we have obtained an e®ective Hamiltonian with a f-band term in addition to the Kondo interaction for S = 1 spins. The results indicate a coexistence of Kondo e®ect and ferromagnetic order, with di®erent relative values of the Kondo TK and Curie TC temperatures. We emphasize here especially the case TK < TC where there is a Kondo behavior below TC and a clear decrease of the magnetization below TK. Such a behavior has been observed in the magnetization curves of NpNiSi2 at low temperatures. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012 |
dc.date.accessioned.fl_str_mv |
2015-02-10T02:17:35Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/109913 |
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1742-6588 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000900441 |
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1742-6588 000900441 |
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http://hdl.handle.net/10183/109913 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Journal of physics : conference series. Bristol. Vol. 391 (2012), 012174, 5 p. |
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openAccess |
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