Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies
- Autores
- Ferrari, V.; Llois, Ana Maria; Vildosola, Veronica Laura
- Año de publicación
- 2010
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We perform an electronic structure study for cerium oxide homogeneously doped with cobalt impurities, focusing on the role played by oxygen vacancies and structural relaxation. By means of full-potential abinitio methods, we explore the possibility of ferromagnetism as observed in recent experiments. Our results indicate that oxygen vacancies seem to be crucial for the appearance of a ferromagnetic alignment among Co impurities, obtaining an increasing tendency towards ferromagnetism with growing vacancy concentration. However, the estimated couplings cannot explain the experimentally observed room-temperature ferromagnetism. In this systematic study, we draw relevant conclusions regarding the location of the oxygen vacancies and the magnetic couplings involved. In particular, we find that oxygen vacancies tend to nucleate in the neighborhood of Co impurities and we get a remarkably strong ferromagnetic coupling between Co atoms and the Ce3 + neighboring ions. The calculated magnetic moments per cell depend on the degree of reduction, which could explain the wide spread in the magnetization values observed in the experiments.
Fil: Ferrari, V.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
Fil: Llois, Ana Maria. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina
Fil: Vildosola, Veronica Laura. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina - Materia
-
Point defects and defect clusters
Saturation moments and magnetic susceptibilities
Nonmetallic ferromagnetic materials
Density functional theory, local density approximation, gradient and other corrections - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/190115
Ver los metadatos del registro completo
id |
CONICETDig_13688dd58b63a4240694c46100c3e0f1 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/190115 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacanciesFerrari, V.Llois, Ana MariaVildosola, Veronica LauraPoint defects and defect clustersSaturation moments and magnetic susceptibilitiesNonmetallic ferromagnetic materialsDensity functional theory, local density approximation, gradient and other correctionshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We perform an electronic structure study for cerium oxide homogeneously doped with cobalt impurities, focusing on the role played by oxygen vacancies and structural relaxation. By means of full-potential abinitio methods, we explore the possibility of ferromagnetism as observed in recent experiments. Our results indicate that oxygen vacancies seem to be crucial for the appearance of a ferromagnetic alignment among Co impurities, obtaining an increasing tendency towards ferromagnetism with growing vacancy concentration. However, the estimated couplings cannot explain the experimentally observed room-temperature ferromagnetism. In this systematic study, we draw relevant conclusions regarding the location of the oxygen vacancies and the magnetic couplings involved. In particular, we find that oxygen vacancies tend to nucleate in the neighborhood of Co impurities and we get a remarkably strong ferromagnetic coupling between Co atoms and the Ce3 + neighboring ions. The calculated magnetic moments per cell depend on the degree of reduction, which could explain the wide spread in the magnetization values observed in the experiments.Fil: Ferrari, V.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Llois, Ana Maria. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; ArgentinaFil: Vildosola, Veronica Laura. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaIOP Publishing2010-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/190115Ferrari, V.; Llois, Ana Maria; Vildosola, Veronica Laura; Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies; IOP Publishing; Journal of Physics: Condensed Matter; 22; 27; 6-2010; 1-100953-8984CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.1088/0953-8984/22/27/276002info:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/22/27/276002info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:46:53Zoai:ri.conicet.gov.ar:11336/190115instacron: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:34982025-09-29 09:46:53.846CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
title |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
spellingShingle |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies Ferrari, V. Point defects and defect clusters Saturation moments and magnetic susceptibilities Nonmetallic ferromagnetic materials Density functional theory, local density approximation, gradient and other corrections |
title_short |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
title_full |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
title_fullStr |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
title_full_unstemmed |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
title_sort |
Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies |
dc.creator.none.fl_str_mv |
Ferrari, V. Llois, Ana Maria Vildosola, Veronica Laura |
author |
Ferrari, V. |
author_facet |
Ferrari, V. Llois, Ana Maria Vildosola, Veronica Laura |
author_role |
author |
author2 |
Llois, Ana Maria Vildosola, Veronica Laura |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Point defects and defect clusters Saturation moments and magnetic susceptibilities Nonmetallic ferromagnetic materials Density functional theory, local density approximation, gradient and other corrections |
topic |
Point defects and defect clusters Saturation moments and magnetic susceptibilities Nonmetallic ferromagnetic materials Density functional theory, local density approximation, gradient and other corrections |
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 perform an electronic structure study for cerium oxide homogeneously doped with cobalt impurities, focusing on the role played by oxygen vacancies and structural relaxation. By means of full-potential abinitio methods, we explore the possibility of ferromagnetism as observed in recent experiments. Our results indicate that oxygen vacancies seem to be crucial for the appearance of a ferromagnetic alignment among Co impurities, obtaining an increasing tendency towards ferromagnetism with growing vacancy concentration. However, the estimated couplings cannot explain the experimentally observed room-temperature ferromagnetism. In this systematic study, we draw relevant conclusions regarding the location of the oxygen vacancies and the magnetic couplings involved. In particular, we find that oxygen vacancies tend to nucleate in the neighborhood of Co impurities and we get a remarkably strong ferromagnetic coupling between Co atoms and the Ce3 + neighboring ions. The calculated magnetic moments per cell depend on the degree of reduction, which could explain the wide spread in the magnetization values observed in the experiments. Fil: Ferrari, V.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina Fil: Llois, Ana Maria. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina Fil: Vildosola, Veronica Laura. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina |
description |
We perform an electronic structure study for cerium oxide homogeneously doped with cobalt impurities, focusing on the role played by oxygen vacancies and structural relaxation. By means of full-potential abinitio methods, we explore the possibility of ferromagnetism as observed in recent experiments. Our results indicate that oxygen vacancies seem to be crucial for the appearance of a ferromagnetic alignment among Co impurities, obtaining an increasing tendency towards ferromagnetism with growing vacancy concentration. However, the estimated couplings cannot explain the experimentally observed room-temperature ferromagnetism. In this systematic study, we draw relevant conclusions regarding the location of the oxygen vacancies and the magnetic couplings involved. In particular, we find that oxygen vacancies tend to nucleate in the neighborhood of Co impurities and we get a remarkably strong ferromagnetic coupling between Co atoms and the Ce3 + neighboring ions. The calculated magnetic moments per cell depend on the degree of reduction, which could explain the wide spread in the magnetization values observed in the experiments. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-06 |
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/11336/190115 Ferrari, V.; Llois, Ana Maria; Vildosola, Veronica Laura; Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies; IOP Publishing; Journal of Physics: Condensed Matter; 22; 27; 6-2010; 1-10 0953-8984 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/190115 |
identifier_str_mv |
Ferrari, V.; Llois, Ana Maria; Vildosola, Veronica Laura; Co-doped ceria: Tendency towards ferromagnetism driven by oxygen vacancies; IOP Publishing; Journal of Physics: Condensed Matter; 22; 27; 6-2010; 1-10 0953-8984 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.1088/0953-8984/22/27/276002 info:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/22/27/276002 |
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 |
_version_ |
1844613462832971776 |
score |
13.070432 |