Phonon spectroscopy in FeSe using high-resolution inelastic x-ray scattering

ORAL

Abstract

We report an inelastic x-ray scattering investigation of phonons in FeSe superconductor. Comparing the experimental phonon dispersion with density functional theory (DFT) calculations in the non-magnetic state, we found a significant disagreement between them. Improved overall agreement was obtained by allowing for spin-polarization in the DFT calculations, despite the absence of magnetic order in the experiment. This calculation gives a realistic approximation of the disordered paramagnetic state of FeSe, in which strong spin fluctuations are present. We will discuss the current state of our analysis relating magnetism to the phonon dispersion.

–

Presenters

  • Naoki Murai

    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

Authors

  • Naoki Murai

    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Tatsuo Fukuda

    • Materials Sciences Research Center, Japan Atomic Energy Agency

  • Masamichi Nakajima

    • Department of Physics, Osaka University

  • Mitsuaki Kawamura

    • Institute for Solid State Physics, The University of Tokyo

  • Daisuke Ishikawa

    • Japan Synchrotron Radiation Research Institute
    • Materials Dynamics Laboratory, RIKEN SPring-8 Center
    • JASRI/SPring-8

  • Setsuko Tajima

    • Department of Physics, Osaka University

  • Alfred Q. R. Baron

    • RIKEN SPring-8 Center
    • Materials Dynamics Laboratory, RIKEN SPring-8 Center