Spin-resolved electron-phonon coupling in FeSe

ORAL

Abstract

FeSe is one of the simplest iron-based superconductors. There are previous studies indicating that including the iron magnetic moment ordering has a significant effect on electron-phonon interactions and thus might be important for superconductivity. To explore the role of spin-dependent phonon induced pairing of the electrons, we apply first principle techniques based on the pseudopotential density functional approach and the local spin density approximation to calculate the electron-phonon coupling properties of FeSe. Our results indicate that introducing magnetic moments leads to a significant increase in coupling at least for certain phonon modes. At the gamma point in the Brillouin zone the increase is two-fold. Both phonon renormalization and electron-phonon matrix elements increases are present.

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Authors

  • Timur Bazhirov

    University of California Berkeley

  • Jesse Noffsinger

    University of California Berkeley

  • Marvin L. Cohen

    University of California at Berkeley and Lawrence Berkeley National Laboratory, University of California, Berkeley, University of California Berkeley, University of California at Berkeley and Lawrence Berkeley National Lab, Department of Physics, University of California, Berkeley, and Materials Science Division, Lawrence Berkeley National Laboratory