A vortex dynamics approach to the Nernst effect in fluctuating superconductors

Details A vortex dynamics approach to the Nernst effect in fluctuating superconductors A vortex dynamics approach to the Nernst effect in fluctuating superconductors

2008-01-18

arxiv.org/abs/0801.2925v2

Phys. Rev. B 78, 184520 (2008)

Physics

Condensed Matter

Superconductivity

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Scientific paper

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 (e.g., 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. We find that $\alpha_{xy}$ closely tracks the magnetization $(-M/T)$ over a wide range of parameters.

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