T-matrix Impurity Effects on Nematicity in Iron-Based Supeconductors

ORAL

Abstract

In iron-based superconductors, nematicity has been reported in transport measurements and a broad range of spectroscopies, including angle-resolved photoemission, neutron scattering, and scanning tunneling microscopy. These observed anisotropies of broken tetragonal symmetry have been attributed to pure spin physics or unequal occupation of the iron d-electron orbitals, referred to as orbital ordering. To address this issue, we use realistic multi-orbital tight-binding Hamiltonians and T-matrix formalism to explore the effects of non-magnetic impurities. In particular, we present a detailed examination of the local density of states around impurities, and highlight the interplay of magnetic and orbital degrees of freedom.

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Authors

  • Nachum Plonka

    Stanford University and SLAC National Accelerator Laboratory

  • Alexander Kemper

    Stanford University and SLAC National Accelerator Laboratory

  • Tom Devereaux

    Department of Physics, Stanford University, Stanford, SIMES, SLAC National Accelerator Laboratory and Stanford University, Stanford Institute for Materials and Energy Science, Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA, Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Stanford University and SLAC National Accelerator Laboratory, Stanford University