Thickness-dependent magnetic and electrical transport properties of epitaxial La0.7Sr0.3CoO3 films

Binzhi Li; Rajesh V. Chopdekar; Alexander M. Kane; Kyle Hoke; Alpha T. N’Diaye; Elke Arenholz; Yayoi Takamura

doi:10.1063/1.4979921

AIP Advances (Apr 2017)

Thickness-dependent magnetic and electrical transport properties of epitaxial La0.7Sr0.3CoO3 films

Binzhi Li,
Rajesh V. Chopdekar,
Alexander M. Kane,
Kyle Hoke,
Alpha T. N’Diaye,
Elke Arenholz,
Yayoi Takamura

Affiliations

Binzhi Li: Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, USA
Rajesh V. Chopdekar: Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, USA
Alexander M. Kane: Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, USA
Kyle Hoke: Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, USA
Alpha T. N’Diaye: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Elke Arenholz: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Yayoi Takamura: Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, USA

DOI: https://doi.org/10.1063/1.4979921
Journal volume & issue: Vol. 7, no. 4
pp. 045003 – 045003-6

Abstract

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The thickness-dependent magnetic and electrical transport properties of nearly strain-free La0.7Sr0.3CoO3 (LSCO) films grown on (001)-oriented (LaAlO3)0.3 (Sr2AlTaO6)0.7 substrates were systematically studied. A crossover from ferromagnetic/metallic to non-magnetic/insulating behavior occurs at a critical thickness (∼8 nm) that is significantly smaller than LSCO films under larger strains in reported literature. X-ray absorption measurements revealed that the difference of functional properties at reduced film thicknesses was accompanied by changes in the valence state of Co ions at the film/substrate interface.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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