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Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

  • Kenichi Kaminaga
    Kenichi Kaminaga
    Department of Chemistry, The University of Tokyo, Tokyo 113-0033, Japan
    Department of Chemistry, Tohoku University, Sendai 980-8578, Japan
    More by Kenichi Kaminaga
    Orcidhttp://orcid.org/0000-0001-7331-7453
  • , 
  • Daichi Oka
    Daichi Oka
    Department of Chemistry, Tohoku University, Sendai 980-8578, Japan
    More by Daichi Oka
    Orcidhttp://orcid.org/0000-0003-2747-9675
  • , 
  • Tetsuya Hasegawa
    Tetsuya Hasegawa
    Department of Chemistry, The University of Tokyo, Tokyo 113-0033, Japan
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  • , and 
  • Tomoteru Fukumura*
    Tomoteru Fukumura
    Department of Chemistry, Tohoku University, Sendai 980-8578, Japan
    WPI-Advanced Institute for Materials Research and Core Research Cluster, Tohoku University, Sendai 980-8577, Japan
    *[email protected]
    More by Tomoteru Fukumura
Cite this: J. Am. Chem. Soc. 2018, 140, 22, 6754–6757
Publication Date (Web):May 21, 2018
https://doi.org/10.1021/jacs.8b03009
Copyright © 2018 American Chemical Society
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    Abstract

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    We report a superconducting transition in a LaO epitaxial thin film with the superconducting transition onset temperature (Tc) at around 5 K. This Tc is higher than those of other lanthanum monochalcogenides and opposite to their chemical trend: Tc = 0.84, 1.02, and 1.48 K for LaX (X = S, Se, Te), respectively. The carrier control resulted in a dome-shaped Tc as a function of electron carrier density. In addition, the Tc was significantly sensitive to epitaxial strain in spite of the highly symmetric crystal structure. This rock-salt superconducting LaO could be a building block to design novel superlattice superconductors.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/jacs.8b03009.

    • Additional experimental details, rocking curve measurement, O 1s XPS spectra and typical XPS spectra, in-plane magnetization, isothermal magnetoresistance, carrier density and mobility, and table of experimental parameters for samples A–J (PDF)

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