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.

–

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