Nematicity in an Iron-based Superconductor

ORAL

Abstract

The emergence of unconventional superconductivity in proximity to intertwined electronic orders is especially relevant in the case of iron-based superconductors. Such order consists of an electronic nematic order and a spin density wave in these systems. BaNi2As2, like its well-known iron-based analogue BaFe2As2, also hosts a symmetry-breaking structural transition that is coupled to a unidirectional charge density wave (CDW), providing a novel platform to study intertwined orders. Here, through a systematic angle-resolved photoemission spectroscopy study combined with a detwinning B1g uniaxial strain, we identify distinct spectral evidence of bulk band evolution due to the structural transition as well as CDW-induced band folding. In contrast to the nematicity and spin density wave in BaFe2As2, the structural and CDW order parameters in BaNi2As2 are observed to be strongly coupled and do not separate in the presence of uniaxial strain. Our measurements point to a likely lattice origin of the CDW in BaNi2As2.

–

Presenters

  • Yucheng Guo

    • Rice University

Authors

  • Yucheng Guo

    • Rice University

  • Zhaoyu Liu

    • University of Washington

  • Ji Seop Oh

    • University of California Berkeley

  • David J Singh

    • University of Missouri

  • Yaofeng Xie

    • Rice University

  • Mason Klemm

    • Rice University

  • Eli Rotenberg

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

  • Aaron Bostwick

    • Lawrence Berkeley National Laboratory
    • LBNL
    • The Advanced Light Source
    • lawrence berkeley national lab
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
    • Advanced Light Source, Lawrence Berkeley National Lab

  • Christopher Jozwiak

    • Lawrence Berkeley National Laboratory
    • LBNL
    • The Advanced Light Source
    • lawrence berkeley national lab
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
    • Advanced Light Source, Lawrence Berkeley National Lab

  • Sergey Gorovikov

    • Canadian Light Source
    • Canadian Lightsource

  • Tor Pedersen

    • Canadian Light Source
    • Canadian Lightsource

  • Matteo Michiardi

    • University of British Columbia

  • Donghui Lu

    • SLAC - Natl Accelerator Lab

  • Sung-Kwan Mo

    • Lawrence Berkeley National Laboratory

  • Robert J Birgeneau

    • University of California, Berkeley

  • Pengcheng Dai

    • Rice University

  • Jiun-Haw Chu

    • University of Washington
    • University of Washington, Seattle, Washington, USA

  • Ming Yi

    • Rice University