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Título:
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Magneto-resistive coefficient enhancement observed around Verwey-like transition on spinel ferrites XFe?O? (X = Mn, Zn)
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Autores:
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Lopez Maldonado, K. L. ;
Vazquez Zubiate, L. ;
Presa Muñoz del Toro, Patricia de la ;
Matutes Aquino, J. A. ;
Elizalde Galindo, J. T.
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Tipo de documento:
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texto impreso
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Editorial:
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American Institute of Physics, 2014-05-07
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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Manganese and Zinc ferrites were prepared by solid state reaction. The resulting powders were pressed into pellets and heat treated at 1100 ?C. The samples were characterized by using X-ray diffraction, pure phases of zinc ferrite (ZnFe²O?) and manganese ferrite (MnFe?O?) were obtained. Scanning electron microscopy images showed a good contact between particles. A drop of electrical resistance was found in both samples, MnFe?O? and ZnFe?O?, with values going from 2750 to 130 ? and from 1100 to 55 ?, respectively. Transition temperatures were determined to be Tv = 225 K for MnFe?O? and Tv = 130 K for ZnFe?O?. Magnetoresistance measurements were carried out in the temperature range where R showed the transition, defined as the Verwey-like transition temperature range, ?Tv. No magnetoresistive effect was observed out of it. The magnetoresistive coefficient (MRC) observed at ?Tv reached its maximum values of 1.1% for MnFe?O? and 6.68% for ZnFe?O?. The differences between MRC values are related to the divalent metal element used. Finally, the magnetoresistive response indicates that the electrical transition observed is strongly influencing the magnetoresistance; where the underlying responsible for this behavior could be a charge reordering occurring at the Verwey-like transition temperature.
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En línea:
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https://eprints.ucm.es/45497/1/DeLaPresaP%2001%20libre.pdf
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