Noncentrosymmetric Superconductor BeAu

ORAL

Abstract

Noncentrosymmetric superconductors have attracted tremendous research interest due to the
possibility of mixed spin-singlet and spin-triplet pairing in these materials. In this work, physical
properties of the noncentrosymmetric superconductor BeAu were investigated. It was established
that BeAu undergoes a structural phase transition from a room-temperature noncentrosymmetric
FeSi structure type to a high-temperature CsCl structure type. The roomtemperature
modification undergoes a superconducting transition below Tc = 3.3 K. The values of
lower (Hc1 = 32 Oe) and upper (Hc2 = 335 Oe) critical field are rather small, confirming that
this Type II (κG-L = 2.3) weakly coupled (λe-p = 0.5, ΔCe/γnTc = 1.26) superconductor can be
well understood within the Bardeen-Cooper-Schriefer theory. The muon spin relaxation analysis
indicates that the time-reversal symmetry is preserved when the superconducting state is entered,
supporting conventional superconductivity in BeAu.

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Presenters

  • Alfred Amon

    MPI-CPfS

Authors

  • Alfred Amon

    MPI-CPfS

  • Eteri Svanidze

    MPI CPfS, MPI-CPfS

  • Raul Cardoso

    MPI-CPfS

  • Helge Rosner

    Max Planck Inst, MPI-CPfS

  • Murray Wilson

    McMaster University, Physics and Astronomy, McMaster University, Department of Physics and Astronomy, McMaster Univ, Physics and Atmospheric Science, Dalhousie University

  • Matej Bobnar

    MPI-CPfS

  • Walter Schnelle

    Max Planck Institute for Chemical Physics of Solids, MPI-CPfS

  • Jeffrey Lynn

    NIST Center for Neutron Research, NIST center for Neutron Research, NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology, NIST, NCNR, NIST -Natl Inst of Stds & Tech

  • Graeme Luke

    McMaster University, Physics and Astronomy, McMaster University, Department of Physics and Astronomy, McMaster Univ, Department of Physics and Astronomy, McMaster University, Physics and Astronomy, McMaster Univ, MacMaster University, Physics, McMaster University, McMaster Univ

  • Andreas Leithe-Jasper

    MPI-CPfS, MPI CPfS

  • Yuri Grin

    MPI-CPfS, MPI CPfS