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Título

Low-temperature magnetoresistance in polycrystalline manganites: connectivity versus grain size

AutorAndrés, Alicia de; García-Hernández, M.; Martínez, J. L. ; Prieto, C.
Fecha de publicaciónjun-1999
EditorAmerican Institute of Physics
CitaciónApplied Physics Letters 74(25): 3884 (1999)
ResumenWe have performed magnetic and transport measurements on La0.7Ca0.3MnO3 polycrystalline pellets and thin films. We propose a model that reproduces very well the low-field and high-field magnetoresistance at low temperature. The decrease of the resistance at high fields is modeled by the opening of new conduction channels in parallel due to the ordering of Mn spins blocked at the grain surface. We found that high-field magnetoresistance is independent of grain size, at least down to 12 nm, but depends strongly on the connectivity between grains.
Descripción3 pages, 3 figures.
Versión del editorhttp://dx.doi.org/10.1063/1.124212
URIhttp://hdl.handle.net/10261/22097
DOI10.1063/1.124212
ISSN0003-6951
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