Intertwined spin-orbit coupled orders in the iron-based superconductors

ORAL

Abstract

The phase diagram of the underdoped iron-based superconductors exhibits two electronically ordered phases, nematicity and stripe magnetism. Nematic order breaks the rotational symmetry of the lattice and can be seen as a vestigial phase of stripe magnetism. Here we discuss a similar phenomenon occuring for the tetragonal magnetic orders, the spin-vortex crystal and the charge-spin density-wave phases. These vestigial phases break the glide-plane symmetry and render respectively the As/Se or Fe sites inequivalent. In materials with staggered FeAs/Se layers (e.g. 122), these have ordering vector Q=(0,0,π) while in compounds with no staggering (e.g. 111) these are Q=0 orders. We discuss how these vestigial phases couple to the lattice. Moreover, Kramers degeneracy is broken and Rashba- and Dresselhaus-like spin-orbit couplings are induced. Finally, we discuss the behavior under electromagnetic fields, including magneto-electric effects.

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Presenters

  • Morten Holm Christensen

    • University of Minnesota

Authors

  • Morten Holm Christensen

    • University of Minnesota

  • Jian Kang

    • National High Magnetic Field Laboratory, Florida State University

  • William Meier

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, Iowa State University
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Iowa State University and Ames Laboratory
    • Ames Laboratory & Department of Physics, Iowa State University

  • Andreas Kreyssig

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory/Iowa State University
    • Ames Laboratory & Department of Physics, Iowa State University

  • Rafael M Fernandes

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
    • School of Physics and Astronomy, University of Minnesota
    • Physics, University of Minnesota