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Title: Enhanced electron-electron correlations in nanometric epitaxial SrRuO3 epitaxial films
Author: Herranz Casabona, Gervasi
Martínez Benjamin, Joan Josep
Fontcuberta i Griñó, Josep
Sánchez Barrera, Florencio
Ferrater Martorell, Cèsar
García-Cuenca Varona, María Victoria
Varela Fernández, Manuel, 1956-
Keywords: Superfícies
Propietats elèctriques
Electronic structure and electrical properties of surfaces
Issue Date: 2003
Publisher: The American Physical Society
Abstract: Epitaxial and fully strained SrRuO3 thin films have been grown on SrTiO3(100). At initial stages the growth mode is three-dimensional- (3D-)like, leading to a finger-shaped structure aligned with the substrate steps and that eventually evolves into a 2D step-flow growth. We study the impact that the defect structure associated with this unique growth mode transition has on the electronic properties of the films. Detailed analysis of the transport properties of nanometric films reveals that microstructural disorder promotes a shortening of the carrier mean free path. Remarkably enough, at low temperatures, this results in a reinforcement of quantum corrections to the conductivity as predicted by recent models of disordered, strongly correlated electronic systems. This finding may provide a simple explanation for the commonly observed¿in conducting oxides-resistivity minima at low temperature. Simultaneously, the ferromagnetic transition occurring at about 140 K, becomes broader as film thickness decreases down to nanometric range. The relevance of these results for the understanding of the electronic properties of disordered electronic systems and for the technological applications of SrRuO3¿and other ferromagnetic and metallic oxides¿is stressed.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2003, vol. 67, núm. 17, p. 174423-1-174423-8
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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