Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3

The effect of Fe doping (<10%) on polycrystalline samples of La0.7Sr0.3MnO3 has been studied by means of x-ray diffraction, resistivity, ac susceptibility, magnetization, and magnetoresistance measurements. Fe doping does not affect the lattice structure, but it weakens the ferromagnetism and sub...

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Detalles Bibliográficos
Autores: Araújo, José Humberto de, Feitosa, Carlos Chesman de Araújo, Dumelow, T., Xavier Jr, M. M., Cabral, F. A. O.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2000
País:Brasil
Institución:Universidade Federal do Rio Grande do Norte (UFRN)
Repositorio:Repositório Institucional da UFRN
Idioma:inglés
OAI Identifier:oai:repositorio.ufrn.br:123456789/28978
Acceso en línea:https://repositorio.ufrn.br/jspui/handle/123456789/28978
Access Level:acceso abierto
Palabra clave:Magnetic
Transport
Properties
Polycrystalline
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spelling Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3MagneticTransportPropertiesPolycrystallineThe effect of Fe doping (<10%) on polycrystalline samples of La0.7Sr0.3MnO3 has been studied by means of x-ray diffraction, resistivity, ac susceptibility, magnetization, and magnetoresistance measurements. Fe doping does not affect the lattice structure, but it weakens the ferromagnetism and substantially augments the resistivity of the samples. The magnetoresistance of a sample with 10% Fe doping, in a 5 T magnetic field, was 4 times greater than that of the undoped sample near the peak in the resistivity. The results were explained in terms of the formation of antiferromagnetic clusters of Fe ions. At 5 K the magnetoresistance showed no significant dependence on Fe doping, but it displayed large variations in fields below 0.5 T for all samples. This behavior was attributed to spin-polarized tunneling at the grain boundaries of the polycrystalline samples. A variable-range hopping behavior in the resistivity was also encountered in all the samples at low temperatures.The effect of Fe doping (<10%) on polycrystalline samples of La0.7Sr0.3MnO3 has been studied by means of x-ray diffraction, resistivity, ac susceptibility, magnetization, and magnetoresistance measurements. Fe doping does not affect the lattice structure, but it weakens the ferromagnetism and substantially augments the resistivity of the samples. The magnetoresistance of a sample with 10% Fe doping, in a 5 T magnetic field, was 4 times greater than that of the undoped sample near the peak in the resistivity. The results were explained in terms of the formation of antiferromagnetic clusters of Fe ions. At 5 K the magnetoresistance showed no significant dependence on Fe doping, but it displayed large variations in fields below 0.5 T for all samples. This behavior was attributed to spin-polarized tunneling at the grain boundaries of the polycrystalline samples. A variable-range hopping behavior in the resistivity was also encountered in all the samples at low temperatures.American Physical Society2020-05-14T13:51:01Z2020-05-14T13:51:01Z2000-12-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfARAUJO, José Humberto de et al. Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1¿xFexO3. Physical Review. B: Condensed Matter and Materials Physics, v. 63, p. 12408-12411, 2000. ISSN 2469-9969 versão online. DOI https://doi.org/10.1103/PhysRevB.63.012408. Disponivel em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.012408. Acesso em: 14 maio 2020.2469-9969 (online), 2469-9950 (print).https://repositorio.ufrn.br/jspui/handle/123456789/2897810.1103/PhysRevB.63.012408ark:/41046/001300001wvhzengreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessAraújo, José Humberto deFeitosa, Carlos Chesman de AraújoDumelow, T.Xavier Jr, M. M.Cabral, F. A. O.2024-11-06T13:06:52Zoai:repositorio.ufrn.br:123456789/28978Repositório InstitucionalPUBhttp://repositorio.ufrn.br/oai/repositorio@bczm.ufrn.bropendoar:2024-11-06T13:06:52Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false
dc.title.none.fl_str_mv Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
title Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
spellingShingle Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
Araújo, José Humberto de
Magnetic
Transport
Properties
Polycrystalline
title_short Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
title_full Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
title_fullStr Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
title_full_unstemmed Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
title_sort Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3
dc.creator.none.fl_str_mv Araújo, José Humberto de
Feitosa, Carlos Chesman de Araújo
Dumelow, T.
Xavier Jr, M. M.
Cabral, F. A. O.
author Araújo, José Humberto de
author_facet Araújo, José Humberto de
Feitosa, Carlos Chesman de Araújo
Dumelow, T.
Xavier Jr, M. M.
Cabral, F. A. O.
author_role author
author2 Feitosa, Carlos Chesman de Araújo
Dumelow, T.
Xavier Jr, M. M.
Cabral, F. A. O.
author2_role author
author
author
author
dc.subject.por.fl_str_mv Magnetic
Transport
Properties
Polycrystalline
topic Magnetic
Transport
Properties
Polycrystalline
description The effect of Fe doping (<10%) on polycrystalline samples of La0.7Sr0.3MnO3 has been studied by means of x-ray diffraction, resistivity, ac susceptibility, magnetization, and magnetoresistance measurements. Fe doping does not affect the lattice structure, but it weakens the ferromagnetism and substantially augments the resistivity of the samples. The magnetoresistance of a sample with 10% Fe doping, in a 5 T magnetic field, was 4 times greater than that of the undoped sample near the peak in the resistivity. The results were explained in terms of the formation of antiferromagnetic clusters of Fe ions. At 5 K the magnetoresistance showed no significant dependence on Fe doping, but it displayed large variations in fields below 0.5 T for all samples. This behavior was attributed to spin-polarized tunneling at the grain boundaries of the polycrystalline samples. A variable-range hopping behavior in the resistivity was also encountered in all the samples at low temperatures.
publishDate 2000
dc.date.none.fl_str_mv 2000-12-12
2020-05-14T13:51:01Z
2020-05-14T13:51:01Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv ARAUJO, José Humberto de et al. Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1¿xFexO3. Physical Review. B: Condensed Matter and Materials Physics, v. 63, p. 12408-12411, 2000. ISSN 2469-9969 versão online. DOI https://doi.org/10.1103/PhysRevB.63.012408. Disponivel em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.012408. Acesso em: 14 maio 2020.
2469-9969 (online), 2469-9950 (print).
https://repositorio.ufrn.br/jspui/handle/123456789/28978
10.1103/PhysRevB.63.012408
dc.identifier.dark.fl_str_mv ark:/41046/001300001wvhz
identifier_str_mv ARAUJO, José Humberto de et al. Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1¿xFexO3. Physical Review. B: Condensed Matter and Materials Physics, v. 63, p. 12408-12411, 2000. ISSN 2469-9969 versão online. DOI https://doi.org/10.1103/PhysRevB.63.012408. Disponivel em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.63.012408. Acesso em: 14 maio 2020.
2469-9969 (online), 2469-9950 (print).
10.1103/PhysRevB.63.012408
ark:/41046/001300001wvhz
url https://repositorio.ufrn.br/jspui/handle/123456789/28978
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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:Repositório Institucional da UFRN
instname:Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
instname_str Universidade Federal do Rio Grande do Norte (UFRN)
instacron_str UFRN
institution UFRN
reponame_str Repositório Institucional da UFRN
collection Repositório Institucional da UFRN
repository.name.fl_str_mv Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)
repository.mail.fl_str_mv repositorio@bczm.ufrn.br
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score 15,301603

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