Infrared conductivity of superconducting NbTiN in a magnetic field

ORAL

Abstract

The optical conductivity of thin-film Nb$_{0.5}$Ti$_{0.5}$N in applied magnetic fields has been estimated from the results of far-infrared transmission and reflection measurements. The measurements were performed at the National Synchrotron Light Source, Brookhaven National Laboratory at fields up to 10 T. The combined measurements have been analyzed to give the real and imaginary parts of the conductivity. In turn, these quantities allow the magnetic-field dependence of the superconducting energy gap and the superfluid density to be estimated. The effect of pairbreaking by the field on the gap will be discussed.

*This research has been supported by the DOE through contracts DE-FG02-02ER45984 at Florida and DE-AC02-98CH10886 at BNL.

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Authors

  • David Tanner

    • University of Florida Physics Department
    • Physics Department, University of Florida
    • University of Florida
    • Department of Physics, University of Florida
    • Department of Physics, Univ. of Florida
    • Department of physics, University of Florida

  • Xiaoxiang Xi

    • Department of Physics, University of Florida
    • Department of Physics, Univ. of Florida
    • University of Florida

  • J. Hwang

    • Department of Physics, Pusan National University
    • Department of Physics, Pusan National Univ.
    • Pusan National University

  • G.L. Carr

    • Brookhaven National Laboratory
    • NSLS, Brookhaven National Laboratory
    • NSLS - Brookhaven National Lab