Origin of Enhancement of Nematicity Due to Superconductivity in FeSe1-xSx

ORAL

Abstract

The origin of both superconductivity and nematicity in bulk FeSe is currently under debate. Important clues can be obtained by investigating the interplay between these two orders. Recent thermal expansion measurements on pure and S-doped bulk FeSe have found that in contrast to other iron-based systems, the nematic order parameter is enhanced due to the onset of superconductivity, rather than suppressed as in the canonical Ba-122 system. Here we study a model where electronic nematicity is described by a d-wave Pomeranchuk instability, and superconductivity in the nematic phase is assumed to arise from an anisotropic pairing interaction in the orthorhombic phase. Within mean-field theory, we discuss the question of under which circumstances enhancement of nematic order below the superconducting transition is possible.

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Presenters

  • Xiao Chen

    Department of Physics, University of Florida

Authors

  • Xiao Chen

    Department of Physics, University of Florida

  • Saurabh Maiti

    Physics, University of Massachusetts, Amherst, Department of Physics, University of Massachusetts

  • Rafael Fernandes

    School of Physics and Astronomy, University of Minnesota, School of Physics and Astronomy , University of Minnesota, School of Physics and Astronomy, Univ of Minnesota - Twin Cities, Univ of Minn - Minneapolis, School of Phys., Univ. of Minnesota - Minneapolis, University of Minnesota

  • Peter Hirschfeld

    Department of Physics, University of Florida, University of Florida, Univ of Florida - Gainesville, University of Florida - Gainesville, PHYSICS, UNIVERSITY OF FLORIDA