Spontaneous currents in a superconductor with s+is symmetry

ORAL

Abstract

We analyze s + is state proposed as a candidate superconducting state for strongly hole-doped Ba-122. Such a state breaks time-reversal symmetry (TRS) but does not break any other discrete symmetry. We address the issue whether TRS breaking alone can generate spontaneous currents near impurity sites, which could be detected in, e.g., ?SR experiments. We argue that there are no spontaneous currents if only TRS is broken. However, supercurrents do emerge if the system is put under external strain and C4 lattice rotation symmetry is externally broken.

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Authors

  • Manfred Sigrist

    Institut fur Theoretische Physik, ETH Zurich

  • Saurabh Maiti

    University of Florida, Gainesville and National High Magnetic Field Lab., Tallahassee, University of Florida, Gainesville and National High Magnetic Field Lab, Tallahasse, Univerity of Florida and NHMFL, Univ of Florida - Gainesville

  • Andrey Chubukov

    Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA, University of Minnesota, Univ of Minnesota, William I. Fine Theoretical Physics Institute, and School of Physics and Astronomy, University of Minnesota