Discontinuous transitions in double-exchange materials

It is shown that the double-exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first-order transitions between phases with different electronic densities and/or magnetizations. The paramagnetic-ferromagnetic transition moves towards lower temperatures, and becomes...

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Detalles Bibliográficos
Autores: Alonso, J. L., Fernández Pérez, Luis Antonio, Guinea, F, Laliena, V., Martín Mayor, Víctor
Tipo de recurso: artículo
Fecha de publicación:2001
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/60058
Acceso en línea:https://hdl.handle.net/20.500.14352/60058
Access Level:acceso abierto
Palabra clave:53
Inelastic-neutron-scattering
Metal-insulator-transition
Mixed-valence manganites
Spectral moments method
colossal-magnetoresistance
Phase-separation
Manganese perovskites
Spin dynamics
Ferromagnetic manganites
Charge localization.
Física (Física)
Física-Modelos matemáticos
22 Física
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oai_identifier_str oai:docta.ucm.es:20.500.14352/60058
network_acronym_str ES
network_name_str España
repository_id_str
spelling Discontinuous transitions in double-exchange materialsAlonso, J. L.Fernández Pérez, Luis AntonioGuinea, FLaliena, V.Martín Mayor, Víctor53Inelastic-neutron-scatteringMetal-insulator-transitionMixed-valence manganitesSpectral moments methodcolossal-magnetoresistancePhase-separationManganese perovskitesSpin dynamicsFerromagnetic manganitesCharge localization.Física (Física)Física-Modelos matemáticos22 FísicaIt is shown that the double-exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first-order transitions between phases with different electronic densities and/or magnetizations. The paramagnetic-ferromagnetic transition moves towards lower temperatures, and becomes discontinuous as the relative strength of the double-exchange mechanism and antiferromagnetic coupling is changed. This trend is consistent with the observed differences between compounds with the same nominal doping, such as La_(2/3)Sr_(1/3)MnO_(3) and La_(2/3)Ca_(1/3)MnO_(3). Our results suggest that, in the low doping regime, a simple magnetic mechanism suffices to explain the main features of the phase diagram.American Physical SocietyUniversidad Complutense de Madrid20012001-02-0120012001-02-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/60058reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/600582026-06-02T12:44:21Z
dc.title.none.fl_str_mv Discontinuous transitions in double-exchange materials
title Discontinuous transitions in double-exchange materials
spellingShingle Discontinuous transitions in double-exchange materials
Alonso, J. L.
53
Inelastic-neutron-scattering
Metal-insulator-transition
Mixed-valence manganites
Spectral moments method
colossal-magnetoresistance
Phase-separation
Manganese perovskites
Spin dynamics
Ferromagnetic manganites
Charge localization.
Física (Física)
Física-Modelos matemáticos
22 Física
title_short Discontinuous transitions in double-exchange materials
title_full Discontinuous transitions in double-exchange materials
title_fullStr Discontinuous transitions in double-exchange materials
title_full_unstemmed Discontinuous transitions in double-exchange materials
title_sort Discontinuous transitions in double-exchange materials
dc.creator.none.fl_str_mv Alonso, J. L.
Fernández Pérez, Luis Antonio
Guinea, F
Laliena, V.
Martín Mayor, Víctor
author Alonso, J. L.
author_facet Alonso, J. L.
Fernández Pérez, Luis Antonio
Guinea, F
Laliena, V.
Martín Mayor, Víctor
author_role author
author2 Fernández Pérez, Luis Antonio
Guinea, F
Laliena, V.
Martín Mayor, Víctor
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 53
Inelastic-neutron-scattering
Metal-insulator-transition
Mixed-valence manganites
Spectral moments method
colossal-magnetoresistance
Phase-separation
Manganese perovskites
Spin dynamics
Ferromagnetic manganites
Charge localization.
Física (Física)
Física-Modelos matemáticos
22 Física
topic 53
Inelastic-neutron-scattering
Metal-insulator-transition
Mixed-valence manganites
Spectral moments method
colossal-magnetoresistance
Phase-separation
Manganese perovskites
Spin dynamics
Ferromagnetic manganites
Charge localization.
Física (Física)
Física-Modelos matemáticos
22 Física
description It is shown that the double-exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first-order transitions between phases with different electronic densities and/or magnetizations. The paramagnetic-ferromagnetic transition moves towards lower temperatures, and becomes discontinuous as the relative strength of the double-exchange mechanism and antiferromagnetic coupling is changed. This trend is consistent with the observed differences between compounds with the same nominal doping, such as La_(2/3)Sr_(1/3)MnO_(3) and La_(2/3)Ca_(1/3)MnO_(3). Our results suggest that, in the low doping regime, a simple magnetic mechanism suffices to explain the main features of the phase diagram.
publishDate 2001
dc.date.none.fl_str_mv 2001
2001-02-01
2001
2001-02-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/60058
url https://hdl.handle.net/20.500.14352/60058
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869419446777413632
score 15.301603

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