Observation of low-energy phonon anomalies in Ca0.73La0.27FeAs2

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