Mostrar el registro sencillo del ítem
dc.contributor.author
Winkler, Elin Lilian
dc.contributor.author
Tovar, Manuel
dc.contributor.author
Causa, M. T.
dc.date.available
2016-12-06T22:11:21Z
dc.date.issued
2013-06
dc.identifier.citation
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
dc.identifier.issn
0953-8984
dc.identifier.uri
http://hdl.handle.net/11336/8962
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Iop Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Manganites
dc.subject
Electron Spin Resonance
dc.subject
Dimers
dc.subject
Delocalized
dc.subject
Localized States
dc.subject.classification
Física de los Materiales Condensados
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Delocalized and localized states of eg electrons in half-doped manganites
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-12-06T16:32:26Z
dc.journal.volume
25
dc.journal.number
29
dc.journal.pagination
296003-296010
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
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
dc.description.fil
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
dc.description.fil
Fil: Causa, M. T.. Comision Nacional de Energia Atomica. Gerencia del Area de Investigaciones y Aplicaciones no Nucleares. Gerencia de Fisica (CAB); Argentina
dc.journal.title
Journal Of Physics: Condensed Matter
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/25/29/296003/meta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0953-8984/25/29/296003
Archivos asociados