Anomalous Nernst effect and heat transport by vortex vacancies in granular superconductors

Details Anomalous Nernst effect and heat transport by vortex vacancies in granular superconductors Anomalous Nernst effect and heat transport by vortex vacancies in granular superconductors

2009-11-09

arxiv.org/abs/0911.1628v2

Phys. Rev. B 81, 060508(R) (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.81.060508

We study the Nernst effect due to vortex motion in two-dimensional granular superconductors using simulations with Langevin or resistively shunted Josephson-junction dynamics. In particular, we show that the geometric frustration of both regular and irregular granular materials can lead to thermally driven transport of vortices from colder to hotter regions, resulting in a sign reversal of the Nernst signal. We discuss the underlying mechanisms of this anomalous behavior in terms of heat transport by mobile vacancies in an otherwise pinned vortex lattice.

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