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Fitting of transport measurements in polycrystalline La2/3Ca1/3MnO3 |
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| Authors: | A D Hernndez C Hart R Escudero O Ars |
| Institution: | a Laboratorio de Superconductividad, IMRE, Universidad de la Habana, San Lázaro y L, 10400, Ciudad Habana, Cuba b Centro Atómico de Bariloche, 8400 San Carlos de Bariloche, Río Negro, Argentina c Laboratorio de Bajas Temperaturas, Instituto de Investigación de Materiales UNAM, Mexico DF, Mexico |
| Abstract: | Using a previous qualitative explanation to describe the transport properties of polycrystalline La2/3Ca1/3MnO3 thick films, we achieved a good fit of the temperature dependence of the resistance R(T). Depending on the sample, we have observed different metal–insulator (MI) transitions while the magnetic behavior is always similar. Small regions of depleted Tc adjacent to the grain boundary could have an important resistance contribution without affecting the magnetic properties in an appreciable manner. In this work, we achieve a quantitative explanation for the different transport behaviors that we have observed experimentally. |
| Keywords: | Manganites Metal–insulator transition Extrinsic magnetoresistance |
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