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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Principais autores: Araújo, José Humberto de, Feitosa, Carlos Chesman de Araújo, Dumelow, T., Xavier Jr, M. M., Cabral, F. A. O.
Formato: article
Idioma:English
Publicado em: American Physical Society
Assuntos:
Magnetic
Transport
Properties
Polycrystalline
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/28978
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spelling ri-123456789-289782020-06-25T17:34:39Z Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3. Araújo, José Humberto de Feitosa, Carlos Chesman de Araújo Dumelow, T. Xavier Jr, M. M. Cabral, F. A. O. Magnetic Transport Properties Polycrystalline 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. 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. 2020-05-14T13:51:01Z 2020-05-14T13:51:01Z 2000-12-12 article 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 en application/pdf American Physical Society
institution Repositório Institucional
collection RI - UFRN
language English
topic Magnetic
Transport
Properties
Polycrystalline
spellingShingle Magnetic
Transport
Properties
Polycrystalline
Araújo, José Humberto de
Feitosa, Carlos Chesman de Araújo
Dumelow, T.
Xavier Jr, M. M.
Cabral, F. A. O.
Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3.
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.
format article
author Araújo, José Humberto de
Feitosa, Carlos Chesman de Araújo
Dumelow, T.
Xavier Jr, M. M.
Cabral, F. A. O.
author_facet Araújo, José Humberto de
Feitosa, Carlos Chesman de Araújo
Dumelow, T.
Xavier Jr, M. M.
Cabral, F. A. O.
author_sort Araújo, José Humberto de
title Magnetic and transport properties of polycrystalline La0.7Sr0.3Mn1-xFexO3.
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.
publisher American Physical Society
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/28978
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AT dumelowt magneticandtransportpropertiesofpolycrystallinela07sr03mn1xfexo3
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AT cabralfao magneticandtransportpropertiesofpolycrystallinela07sr03mn1xfexo3
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