Nematicity studied with strain-dependent ARPES

ORAL

Abstract

Nematicity is a phenomenon found in an increasing number of strongly correlated materials in close proximity to other quantum phases such as unconventional superconductivity. It is therefore important to understand its microscopic origin. The phase diagram of most iron-based superconductors contains a nematic phase. It breaks rotational symmetry and involves an in-plane anisotropy of lattice, spin and charge degrees of freedom. It is currently debated whether spin or orbital degrees of freedom are the driving force and whether there is a common microscopic mechanism in iron-based superconductors with and without magnetic order. We were able to combine angel-resolved photoemission spectroscopy (ARPES) with in-situ tuneable uniaxial strain and determine the momentum dependence of the nematic order parameter in FeSe and BaFe2As2. The order parameter has the same non-trivial symmetry in both compounds suggesting a universal behavior and a common microscopic mechanism.

*Supported by the U.S. Department of Energy, Office of Basic Energy Sciences; Humboldt Foundation; German Science Foundation

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Presenters

  • Heike Pfau

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory

Authors

  • Heike Pfau

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory

  • Su-Di Chen

    • Stanford University
    • Applied Physics, Stanford University
    • SLAC National Accelerator Laboratory
    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University
    • Stanford Univ

  • Ming Yi

    • Rice Univ
    • Physics and Astronomy, Rice University
    • Department of Physics and Astronomy, Rice University
    • Rice University

  • Makoto Hashimoto

    • SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource
    • Stanford Synchrotron Radiation Lightsource
    • SSRL, SLAC National Laboratory
    • SLAC National Accelerator Laboratory
    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Costel R. Rotundu

    • Stanford Institute of Materials and Energy Science, SLAC National Accelerator Laboratory
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • SIMES, SLAC - Natl Accelerator Lab

  • Johanna Palmstrom

    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University
    • Stanford Univ

  • Tong Chen

    • Department of Physics and Astronomy, Rice University

  • Peng-Cheng Dai

    • Department of Physics and Astronomy, Rice University

  • Joshua A Straquadine

    • Stanford Univ
    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University
    • Department of Applied Physics, Stanford University

  • Alexander T Hristov

    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University

  • Robert J Birgeneau

    • University of California, Berkeley
    • Physics, University of California at Berkeley
    • Physics, University of California, Berkeley
    • Department of Physics, University of California, Berkeley

  • Donghui Lu

    • SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource
    • Stanford Synchrotron Radiation Lightsource
    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Ian Fisher

    • Stanford University
    • Stanford Univ
    • Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University
    • Geballe Laboratory for Advanced Materials & Dept. of Applied Physics, Stanford University
    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University
    • Geballe Laboratory for Advanced Materials, Stanford University
    • Department of Applied Physics, Stanford University

  • Zhixun Shen

    • Standford
    • Stanford University
    • Stanford Univeristy
    • Applied Physics, Stanford University
    • SLAC National Accelerator Laboratory
    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • SIMES, SLAC - Natl Accelerator Lab
    • Stanford Univ