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Magnetic field effect on quantum corrections to the low-temperature conductivity in mettalic perovskite oxides
Herranz Casabona, Gervasi; Sánchez Barrera, Florencio; Fontcuberta i Griñó, Josep; Laukhin, Vladimir; Galibert, J.; García-Cuenca Varona, María Victoria; Ferrater Martorell, Cèsar; Varela Fernández, Manuel, 1956-
Universitat de Barcelona
The transport and magnetotransport properties of the metallic and ferromagnetic SrRuO3 (SRO) and the metallic and paramagnetic LaNiO3 (LNO) epitaxial thin films have been investigated in fields up to 55 T at temperatures down to 1.8 K . At low temperatures both samples display a well-defined resistivity minimum. We argue that this behavior is due to the increasing relevance of quantum corrections to the conductivity (QCC) as temperature is lowered; this effect being particularly relevant in these oxides due to their short mean free path. However, it is not straightforward to discriminate between contributions of weak localization and renormalization of electron-electron interactions to the QCC through temperature dependence alone. We have taken advantage of the distinct effect of a magnetic field on both mechanisms to demonstrate that in ferromagnetic SRO the weak-localization contribution is suppressed by the large internal field leaving only renormalized electron-electron interactions, whereas in the nonmagnetic LNO thin films the weak-localization term is relevant.
2010-05-04
Matèria condensada
Superfícies (Física)
Propietats magnètiques
Electronic transport in condensed matter
Electronic structure and electrical properties of surfaces
(c) The American Physical Society, 2005
Article
The American Physical Society
         

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Sánchez Barrera, Florencio; Herranz Casabona, Gervasi; Fontcuberta i Griñó, Josep; García-Cuenca Varona, María Victoria; Ferrater Martorell, Cèsar; Varela Fernández, Manuel, 1956-
 

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