Electronic Raman scattering in Bi-based superconductors under pressure

POSTER

Abstract

Determining the nature of interaction responsible for the Cooper-pair formation in cuprates remains unsettled. The most probable candidates are lattice vibrations (phonons) and spin fluctuation modes. Recently, it has been argued that Raman scattering in $B_{1g}$ symmetry may serve as a probe to distinguish between phonon-mediated and magnetically mediated $d$-wave superconductivity. Here we report the results of electronic Raman scattering measurements in Bi-based bilayer and trilayer superconductors at high pressures and at temperatures around 12 K. As a clean and effective tool, pressure enhances $T_{c}$ and thus increases the pairing interaction in these materials. Meanwhile, we find that pressure also brings about the change of the $B_{1g}$ mode. The observed evolution of $B_{1g}$ modes with pressure sheds important insight on the pairing mechanism of high-$T_{c}$ superconductivity.

*This work was supported by the U.S. DOE.

Authors

  • Xiaojia Chen

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, U.S.A.
    • Geophysical Laboratory, Carnegie Institution of Washington
    • Carnegie Institution of Washington

  • Viktor V. Struzhkin

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, U.S.A.
    • Geophysical Laboratory, Carnegie Institution of Washington

  • Alexander F. Goncharov

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, U.S.A.

  • Russell J. Hemley

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, U.S.A.
    • Geophysical Laboratory, Carnegie Institution of Washington

  • Ho-kwang Mao

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, U.S.A.
    • Geophysical Laboratory, Carnegie Institution of Washington

  • Cheng-Tian Lin

    • Max-Planck-Institut f\"{u}r Festk\"{o}rperforschung, D-70569 Stuttgart, Germany
    • Max-Planck-Institut f\"ur Festk\"orperforschung, Germany

  • Jian-Xin Zhu

    • Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.
    • Theoretical Division, Los Alamos National Laboratory