Noncentrosymmetric superconductivity in epitaxial half-Huesler LaPtBi films

ORAL

Abstract

The lack of inversion symmetry and presence of superconductivity makes half-Huesler compound LaPtBi a noncentrosymmetric superconductor. The LaPtBi films we study are grown on MgO by molecular beam epitaxy with significant compressive strain in the films. Magneto-resistance in the normal state exhibits a cusp-like minima at low magnetic fields which only depends on the total magnetic field. This is attributed to electron-electron interaction effects in disordered systems. Transmission electron microscopy images also confirm the nanocrystalline film growth. We observe superconductivity at onset of 0.7 K. The critical magnetic field has a linear dependence on temperature down to 50 mK, a non BCS type behavior. The critical current decreases linearly with magnetic field. The IV characterestics indicate the presence of intrinsic Josephson effect in the nanocrystalline films.

*We would like to acknowledge National Science Foundation (NSF-DMR 1700137) , Office of Naval Research (ONR N00014-16-1-2657) and Center for Integrated Quantum Materials (DMR-1231319) for financial support.

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Presenters

  • Debaleena Nandi

    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory

Authors

  • Debaleena Nandi

    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory

  • Yunbo Ou

    • Physics, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology
    • State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Katie Huang

    • School of Applied Sciences and Engineering, Harvard University
    • Department of Physics, Harvard University

  • Cigdem Ozsoy-Keskinbora

    • School of Applied Sciences and Engineering, Harvard University
    • School of Engineering and Applied Sciences, Harvard University
    • Engineering and Applied Sciences, Harvard University

  • Stephan Kraemer

    • School of Applied Sciences and Engineering, Harvard University
    • Center for Nanoscale Systems, Harvard University

  • David Bell

    • Centre for Nanoscale Systems, Harvard University
    • School of Engineering and Applied Sciences, Harvard University

  • Philip Kim

    • Physics, Harvard University
    • Harvard University
    • Department of Physics, Harvard University
    • Harvard Univ
    • Physics, Harvard
    • Department of Physics, Harvard university
    • School of Applied Sciences and Engineering, Harvard University

  • Amir Yacoby

    • Harvard University
    • Department of Physics, Harvard University
    • Physics, Harvard University
    • Physics, Harvard Univ
    • Harvard Univ
    • School of Applied Sciences and Engineering, Harvard University

  • Jagadeesh Moodera

    • Physics, MIT
    • Physics, Massachusetts Institute of Technology
    • Department of Physics and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • Department of Physics and Francis Bitter Magnet Lab, Massachusetts Institute of Technology,
    • Department of Physics, Massachusetts Institute of Technology
    • MIT
    • Department of Physics, Massachussetts Institute of Technology