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

Abstract

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.

4 pages, 4 figures

References in corpus (3)

• Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors
• Nernst effect and diamagnetism in phase fluctuating superconductors
• Nernst effect as a probe of superconducting fluctuations in disordered thin films

Cited by in corpus (6)

• A quantitative description of Nernst effect in high-temperature superconductors
• Numerical Simulation of the Nernst Effect in Extreme Type-II Superconductors: A Negative Nernst Signal and its Noise Power Spectra
• Influence of vortices and phase fluctuations on thermoelectric transport properties of superconductors in a magnetic field
• Anomalous mesoscopic kinetics in disordered superconductors
• Flux-induced Nernst effect in a superconducting loop
• Nernst Sign-Reversal in the Hexatic Vortex Phase of Weakly Disordered a-MoGe Thin Films