Low-energy phonons and superconductivity in Sn$_{.8}$In$_{.2}$Te

ORAL

Abstract

We present neutron scattering measurements on low-energy phonons from a superconducting ($Tc =$ 2.7 K) Sn$_{.8}$In$_{.2}$Te single crystal sample. The longitudinal acoustic phonon mode and one transverse acoustic branch have been mapped out around the (002) Bragg peak for temperatures of 1.7 K and 4.2 K. We observe a substantial energy width of the transverse phonons at energies comparable to twice the superconducting gap; however, there is no change in this width between the superconducting and normal states. We also confirm that the compound is well ordered, with no indications of structural instability.

*This work is supported by the Office of Basic Energy Sciences, DOE.

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Authors

  • Guangyong Xu

    • Brookhaven National Laboratory
    • Brookhaven National Lab

  • Zhijun Xu

    • UC Berkeley
    • University of California, Berkeley

  • John Schneeloch

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY 11973, USA
    • Brookhaven Natl Lab
    • BNL, Stony Brook
    • Brookhaven National Lab

  • Ruidan Zhong

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY 11973, USA
    • BNL, Stony Brook
    • Brookhaven National Lab

  • J.A. Rodriguez-Rivera

    • NIST Center for Neutron Research
    • NIST

  • L. Harriger

    • NIST Center for Neutron Research

  • Robert Birgeneau

    • UC Berkeley

  • Genda Gu

    • Brookhaven National Lab
    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY 11973, USA
    • Brookhaven Natl Lab
    • BNL
    • Department of Physics, Brookhaven National Laboratory
    • Brookhaven National Lab, Upton, NY
    • University of Colorado at Boulder

  • John Tranquada

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY 11973, USA
    • Brookhaven Natl Lab
    • BNl