Muon spin relaxation studies of time-reversal symmetry breaking superconductivity in Sr<sub>2</sub>RuO<sub>4</sub> along with the application of uniaxial stress and disorder

ORAL

Abstract

After extensive research, idea regarding the symmetry of the superconducting order parameter of Sr2RuO4 is still lacking a consensus. Recently, NMR experiments have ruled out the well-discussed px ± ipy state [1]. Nevertheless, complex two-component order parameters are conventionally indicated by time-reversal-symmetry breaking (TRSB) superconductivity. In order to lift the degeneracy between such components application of uniaxial stress is a plausible method [2]. One key prediction for Sr2RuO4, a splitting of the superconducting and TRSB transitions under uniaxial stress has not been observed so far. We report a large stress-induced splitting between the onset temperatures of superconductivity and TRSB transitions observed by muon spin relaxation (µSR) measurements under uniaxial stress. To perform these technically challenging experiments, a customized uniaxial pressure cell was developed which will be presented. We also discuss the effect of disorder on the superconducting and TRSB states by µSR, concerning the chirality of the order parameter.
[1] A. Pustogow, et al., arXiv: 1904.00047; K. Ishida et al., arXiv:1907.12236.
[2] C. Hicks, et al., Science 344, 283 (2014), M.Barber, et al., PRL. 120, 076602 (2018).

*The work is supported by DFG (GR 4667, GRK 1621, SFB 1143).

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Presenters

  • Shreenanda Ghosh

    • Institute for Solid State and Materials Physics,Technical University of Dresden, Germany

Authors

  • Shreenanda Ghosh

    • Institute for Solid State and Materials Physics,Technical University of Dresden, Germany

  • Vadim Grinenko

    • Faculty of Physics, TU Dresden, Germany
    • Institute for Solid State and Materials Physics,Technical University of Dresden, Germany

  • Felix Brückner

    • Faculty of Physics, TU Dresden, Germany
    • Institute for Solid State and Materials Physics,Technical University of Dresden, Germany

  • Rajib Sarkar

    • Faculty of Physics, TU Dresden, Germany
    • Institute for Solid State and Materials Physics,Technical University of Dresden, Germany

  • Jean-Christophe Orain

    • Paul-Scherrer-Institut, Villigen, Switzerland
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland

  • Artem Nikitin

    • Paul-Scherrer-Institut, Villigen, Switzerland
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland

  • Debarchan Das

    • Paul-Scherrer-Institut, Villigen, Switzerland
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland

  • Zurab Guguchia

    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland
    • Paul Scherrer Institut
    • Paul-Scherrer-Institut, Villigen, Switzerland
    • Paul Scherrer Institute

  • Joonbum Park

    • Los Alamos National Laboratory
    • Max Planck Institute for Chemical Physics of Solids

  • Mark E Barber

    • MPI CPfS, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids

  • Naoki Kikugawa

    • 5National Institute for Material Science, Japan
    • National Institute for Material Science, Tsukuba Japan
    • National Institute for Material Science, Japan
    • National Institute for Materials Science, Tsukuba, Japan

  • Jake Bobowski

    • Department of Physics, Kyoto University, Japan
    • Department of Physics, Graduate School of Science, Kyoto University, Japan

  • Dmitry Sokolov

    • Max Planck Institute for Chemical Physics of Solids
    • MPI CPfS, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

  • Takuto Miyoshi

    • Department of Physics, Graduate School of Science, Kyoto University, Japan

  • Yoshiteru Maeno

    • Department of Physics, Kyoto University
    • Kyoto Univ.
    • Kyoto University
    • Kyoto Univ
    • Department of Physics, Graduate School of Science, Kyoto University
    • Department of Physics, Kyoto University, Japan
    • Physics, Kyoto Univeristy
    • Physics, Kyoto University
    • Department of Physics, Graduate School of Science, Kyoto University, Japan

  • Andrew Mackenzie

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institut for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • MPI CPfS, Dresden, Germany

  • Hubertus Luetkens

    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Switzerland
    • Paul-Scherrer-Institut, Villigen, Switzerland

  • Clifford W Hicks

    • Max Planck Institute for Chemical Physics of Solids

  • Hans-Henning Klauss

    • Faculty of Physics, TU Dresden, Germany
    • Institute for Solid State and Materials Physics,Technical University of Dresden, Germany