Vortex dynamics and Nernst effect in fluctuating superconductors

ORAL

Abstract

We present a new method to study the Nernst effect and diamagetism of an extreme type II superconductor dominated by phase fluctuations. We work directly with vortex variables and our method allows us to tune vortex parameters (eg. core energy and number of vortex species). We find that diamagnetic response and transverse thermoelectric conductivity ($\alpha_{xy}$) persist well above the Kosterlitz-Thouless transition temperature, and become more pronounced as the vortex core energy is increased. However, they \textit{weaken} as the number of internal vortex states are increased.

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Authors

  • Daniel Poldolsky

    University of Toronto

  • Srinivas Raghu

    Stanford University

  • Ashvin Vishwanath

    Berkeley, Department of Physics, University of California at Berkeley; Material Sciences Division, Lawrence Berkeley National Laboratory, University of California at Berkeley, University of California, Berkeley

  • David Huse

    Department of Physics, Princeton University, Princeton University