Delocalized and localized states of eg electrons in half-doped manganites

Autores
Winkler, Elin Lilian; Tovar, Manuel; Causa, M. T.
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have studied the magnetic behaviour of half-doped manganite Y0.5Ca0.5MnO3 in an extended range of temperatures by means of magnetic susceptibility and electron spin resonance (ESR) experiments. At high temperature the system crystallizes in an orthorhombic structure. The resistivity value ~0:05 Ohm.cm at 500 K, indicates a metallic behaviour, while the Curie-Weiss dependence of the susceptivility and the thermal evolution of the ESR parameters are very well described by a model that considers a system conformed by localized Mn4+ cores,t2g^3, and itinerant, eg, electrons. The strong coupling between t2g and eg electrons results in an enhanced Curie constant and an FM Curie-Weiss temperature that overcomes the AFM interactions between the t2g^3 cores. A transition to a more distorted phase is observed at T ~500 K and signatures of localization of the eg electrons appear in the susceptibility behaviour below 300 K. A new Curie-Weiss regime is observed, where the Curie-constant value is consistent with dimer formation. Based on mean-field calculations, the dimer formation predicted as a function of the interaction strength between the t2g and eg electrons.
Fil: Winkler, Elin Lilian. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte; Argentina
Fil: Tovar, Manuel. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte; Argentina
Fil: Causa, M. T.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
Materia
Manganites
Electron Spin Resonance
Dimers
Delocalized
Localized States
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/8962
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/8962
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Delocalized and localized states of eg electrons in half-doped manganitesWinkler, Elin LilianTovar, ManuelCausa, M. T.ManganitesElectron Spin ResonanceDimersDelocalizedLocalized Stateshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have studied the magnetic behaviour of half-doped manganite Y0.5Ca0.5MnO3 in an extended range of temperatures by means of magnetic susceptibility and electron spin resonance (ESR) experiments. At high temperature the system crystallizes in an orthorhombic structure. The resistivity value ~0:05 Ohm.cm at 500 K, indicates a metallic behaviour, while the Curie-Weiss dependence of the susceptivility and the thermal evolution of the ESR parameters are very well described by a model that considers a system conformed by localized Mn4+ cores,t2g^3, and itinerant, eg, electrons. The strong coupling between t2g and eg electrons results in an enhanced Curie constant and an FM Curie-Weiss temperature that overcomes the AFM interactions between the t2g^3 cores. A transition to a more distorted phase is observed at T ~500 K and signatures of localization of the eg electrons appear in the susceptibility behaviour below 300 K. A new Curie-Weiss regime is observed, where the Curie-constant value is consistent with dimer formation. Based on mean-field calculations, the dimer formation predicted as a function of the interaction strength between the t2g and eg electrons.Fil: Winkler, Elin Lilian. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte; ArgentinaFil: Tovar, Manuel. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte; ArgentinaFil: Causa, M. T.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); ArgentinaIop Publishing2013-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/8962Winkler, Elin Lilian; Tovar, Manuel; Causa, M. T.; Delocalized and localized states of eg electrons in half-doped manganites; Iop Publishing; Journal Of Physics: Condensed Matter; 25; 29; 6-2013; 296003-2960100953-8984enginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/25/29/296003/metainfo:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/25/29/296003info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:07:10Zoai:ri.conicet.gov.ar:11336/8962instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:07:11.089CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Delocalized and localized states of eg electrons in half-doped manganites
title Delocalized and localized states of eg electrons in half-doped manganites
spellingShingle Delocalized and localized states of eg electrons in half-doped manganites
Winkler, Elin Lilian
Manganites
Electron Spin Resonance
Dimers
Delocalized
Localized States
title_short Delocalized and localized states of eg electrons in half-doped manganites
title_full Delocalized and localized states of eg electrons in half-doped manganites
title_fullStr Delocalized and localized states of eg electrons in half-doped manganites
title_full_unstemmed Delocalized and localized states of eg electrons in half-doped manganites
title_sort Delocalized and localized states of eg electrons in half-doped manganites
dc.creator.none.fl_str_mv Winkler, Elin Lilian
Tovar, Manuel
Causa, M. T.
author Winkler, Elin Lilian
author_facet Winkler, Elin Lilian
Tovar, Manuel
Causa, M. T.
author_role author
author2 Tovar, Manuel
Causa, M. T.
author2_role author
author
dc.subject.none.fl_str_mv Manganites
Electron Spin Resonance
Dimers
Delocalized
Localized States
topic Manganites
Electron Spin Resonance
Dimers
Delocalized
Localized States
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We have studied the magnetic behaviour of half-doped manganite Y0.5Ca0.5MnO3 in an extended range of temperatures by means of magnetic susceptibility and electron spin resonance (ESR) experiments. At high temperature the system crystallizes in an orthorhombic structure. The resistivity value ~0:05 Ohm.cm at 500 K, indicates a metallic behaviour, while the Curie-Weiss dependence of the susceptivility and the thermal evolution of the ESR parameters are very well described by a model that considers a system conformed by localized Mn4+ cores,t2g^3, and itinerant, eg, electrons. The strong coupling between t2g and eg electrons results in an enhanced Curie constant and an FM Curie-Weiss temperature that overcomes the AFM interactions between the t2g^3 cores. A transition to a more distorted phase is observed at T ~500 K and signatures of localization of the eg electrons appear in the susceptibility behaviour below 300 K. A new Curie-Weiss regime is observed, where the Curie-constant value is consistent with dimer formation. Based on mean-field calculations, the dimer formation predicted as a function of the interaction strength between the t2g and eg electrons.
Fil: Winkler, Elin Lilian. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte; Argentina
Fil: Tovar, Manuel. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte; Argentina
Fil: Causa, M. T.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
description We have studied the magnetic behaviour of half-doped manganite Y0.5Ca0.5MnO3 in an extended range of temperatures by means of magnetic susceptibility and electron spin resonance (ESR) experiments. At high temperature the system crystallizes in an orthorhombic structure. The resistivity value ~0:05 Ohm.cm at 500 K, indicates a metallic behaviour, while the Curie-Weiss dependence of the susceptivility and the thermal evolution of the ESR parameters are very well described by a model that considers a system conformed by localized Mn4+ cores,t2g^3, and itinerant, eg, electrons. The strong coupling between t2g and eg electrons results in an enhanced Curie constant and an FM Curie-Weiss temperature that overcomes the AFM interactions between the t2g^3 cores. A transition to a more distorted phase is observed at T ~500 K and signatures of localization of the eg electrons appear in the susceptibility behaviour below 300 K. A new Curie-Weiss regime is observed, where the Curie-constant value is consistent with dimer formation. Based on mean-field calculations, the dimer formation predicted as a function of the interaction strength between the t2g and eg electrons.
publishDate 2013
dc.date.none.fl_str_mv 2013-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/8962
Winkler, Elin Lilian; Tovar, Manuel; Causa, M. T.; Delocalized and localized states of eg electrons in half-doped manganites; Iop Publishing; Journal Of Physics: Condensed Matter; 25; 29; 6-2013; 296003-296010
0953-8984
url http://hdl.handle.net/11336/8962
identifier_str_mv Winkler, Elin Lilian; Tovar, Manuel; Causa, M. T.; Delocalized and localized states of eg electrons in half-doped manganites; Iop Publishing; Journal Of Physics: Condensed Matter; 25; 29; 6-2013; 296003-296010
0953-8984
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/25/29/296003/meta
info:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/25/29/296003
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Iop Publishing
publisher.none.fl_str_mv Iop Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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