Theory of thermal conductivity in a multi-band superconductor : Application to pnictides

ORAL

Abstract

We calculate low temperature thermal conductivity within a two band model for newly discovered ferro-pnictide superconductors. We consider three different cases, sign changing s-wave state, highly anisotropic s-wave state and a state with order parameter nodes on one band. To include the effect of disorder, we have performed fully self-consistent T-matrix approximation including both intraband and interband impurity scatterings. We also study the behavior of the low temperature thermal conductivity under applied magnetic field using a recently developed variant of the Brandt-Pesch-Tewordt approximation, and compare our results with latest experimental data.

*Research was partially supported by DOE DE-FG02-05ER46236 (P.J.H.) and DOE DE-FG02-08ER46492 (I.V.). PJH is grateful for the hospitality of the Kavli Institute for Theoretical Physics (under grant NSF-PHY05-51164) during this research work.

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Authors

  • Vivek Mishra

    • Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • Anton Vorontsov

    • Montana State University
    • Department of Physics, Montana State University, Bozeman, Montana 59717, USA

  • Peter Hirschfeld

    • University of Florida
    • Physics/University of Florida
    • Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • I. Vekhter

    • Louisiana State University
    • Department of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA