Search for electron-phonon coupling in superconducting BKBO

ORAL

Abstract

Ba0.6K0.4BiO3 is a superconductor with a Tc $=$ 30 K. While generally regarded as a BCS superconductor, previous work searching along the high-symmetry directions did not find characteristic signatures of electron-phonon coupling near the energy gap of $\sim$ 9 meV. Making use of the new Multizone Phonon Refinement technique, we are able to examine the phonon spectrum at all symmetry points and look for signatures of electron-phonon coupling.

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Authors

  • D. Parshall

    • NIST Center for Neutron Research, Gaithersburg MD 20899

  • J.L. Niedziela

    • Oak Ridge National Laboratory, Oak Ridge TN 37831

  • S. Barilo

    • Institute of Solid State and Semiconductor Physics, Minsk, 220072, Belarus

  • J.W. Lynn

    • NIST Center for Neutron Research, Gaithersburg MD 20899