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.

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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