Observation of low-energy phonon anomalies in Ca<sub>0.73</sub>La<sub>0.27</sub>FeAs<sub>2</sub>

ORAL

Abstract

Couplings between lattice and charge or spin degrees of freedom underpin a wide range of phenomena in strongly correlated electronic systems. Fe-based superconductors provide an important platform in probing the phonon effect on high temperature superconductivity, where spin-phonon interaction is expected to dominate. Ca0.73La0.27FeAs2, considered as a parent compound of the 112 family, has an antiferromagnetic ground state, which gives way to a superconducting state at high pressure. We have performed a systematic inelastic X-ray scattering study on single crystals of Ca0.73La0.27FeAs2, at both ambient and high pressure, and compared the results with density functional theory (DFT) calculations. A low-energy phonon anomaly was observed, and its nature will be discussed.

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Presenters

  • Zhenzhong Shi

    • Duke University
    • Department of Physics, Duke University
    • Dept. of Phys. & Natl. High Magnetic Field Lab., Florida State Univ.

Authors

  • Zhenzhong Shi

    • Duke University
    • Department of Physics, Duke University
    • Dept. of Phys. & Natl. High Magnetic Field Lab., Florida State Univ.

  • Sachith Dissanayake

    • Department of Physics, Duke University
    • Oak Ridge National Laboratory
    • Duke University
    • Oak Ridge National Lab

  • Dipanshu Bansal

    • Indian Institute of Technology Bombay
    • Mechanical Engineering, Indian Institute of Technology Bombay
    • Department of Mechanical Engineering & Materials Science, Duke University

  • Wenli Bi

    • APS, Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Ahmet Alatas

    • Argonne National Laboratory
    • Argonne Natl Lab
    • Advanced Photon Source, Argonne National Laboratory

  • Stephen J Kuhn

    • Department of Physics, Duke University
    • University of Notre Dame

  • Brodie Popovic

    • Physics, Duke University
    • Department of Physics, Duke University

  • Eve Emmanouilidou

    • Department of Physics and Astronomy, University of California, Los Angeles

  • Ni Ni

    • Department of Physics and Astronomy, University of California, Los Angeles
    • University of California Los Angeles
    • University of California, Los Angeles

  • Olivier Delaire

    • Department of Mechanical Engineering and Materials Science, Duke University
    • Mechanical Engineering and Materials Science, Physics, Duke University
    • Duke University
    • Department of Mechanical Engineering & Materials Science, Duke University

  • Ayman Said

    • Argonne National Laboratory
    • Argonne Natl Lab
    • Advanced Photon Source, Argonne National Laboratory

  • Sara Haravifard

    • Physics, Duke University
    • Department of Physics, Duke University
    • Duke University
    • Duke Univ