Thickness-dependent Magnetic and Electrical Transport Properties of Epitaxial La0.7Sr0.3CoO3 Films

  • Authors:
    Binzhi Li (UC/Davis), Rajesh V. Chopdekar (UC/Davis), Alexander M. Kane (UC/Davis), Kyle Hoke (UC/Davis), Alpha N'Diaye (LBNL), Elke Arenholz (LBNL), Yayoi Takamura (UC/Davis)
    Publication ID:
    P090710
    Publication Type:
    Paper
    Received Date:
    17-Apr-2017
    Last Edit Date:
    17-Apr-2017
    Research:
    2309.001 (University of California/Davis)

Abstract

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.

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