We report effects of carrier density and epitaxial strain on superconductivity in rock-salt lanthanum monoxide (LaO) epitaxial thin film. Electron carrier doping via introducing oxygen vacancies resulted in a dome-shaped Tc as a function of carrier density. In addition, epitaxial strain influenced significantly the Tc despite its highly symmetric rock-salt structure. Tc was raised up to 5.2 K in tensilely strained thin film on LaAlO3 substrate, in contrast with Tc of at most 4.5 K in compressive strained film on YAlO3 substrate.This work is supported by JST-CREST, JSPS-KAKENHI (Nos. 26105002, JP17J05331, 18H03872), the Mitsubishi Foundation, and Center for Spintronics Research Network (CSRN), Tohoku University.
APS March Meeting Abstracts
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