Nernst effect as a probe of superconducting fluctuations in disordered thin films

Abstract

In amorphous superconducting thin films of $N{b}_{0.15}S{i}_{0.85}$ and $In{O}_x$, a finite Nernst coefficient can be detected in a wide range of temperature and magnetic field. Due to the negligible contribution of normal quasi-particles, superconducting fluctuations easily dominate the Nernst response in the entire range of study. In the vicinity of the critical temperature and in the zero-field limit, the magnitude of the signal is in quantitative agreement with what is theoretically expected for the Gaussian fluctuations of the superconducting order parameter. Even at higher temperatures and finite magnetic field, the Nernst coefficient is set by the size of superconducting fluctuations. The Nernst coefficient emerges as a direct probe of the ghost critical field, the normal-state mirror of the upper critical field. Moreover, upon leaving the normal state with fluctuating Cooper pairs, we show that the temperature evolution of the Nernst coefficient is different whether the system enters a vortex solid, a vortex liquid or a phase-fluctuating superconducting regime.

Submitted to New. J. Phys. for a focus issue on "Superconductors with Exotic Symmetries"

References in corpus (11)

• The Nernst effect and the boundaries of the Fermi liquid picture
• Enhancement of the Nernst effect by stripe order in a high-Tc superconductor
• Nernst effect in semi-metals: the meritorious heaviness of electrons
• Oscillating Nernst-Ettingshausen effect in Bismuth across the quantum limit
• Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors
• Fluctuations of the superconducting order parameter as an origin of the Nernst effect
• A length scale for the superconducting Nernst signal above T${}_c$ in Nb${}_{0.15}$Si${}_{0.85}$
• Nernst effect in the phase-fluctuating superconductor InO${}_x$
• Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi
• Anomalous thermopower and Nernst effect in $\mathrm{CeCoI}{\mathrm{n}}_5$: entropy-current loss in precursor state
• On the Nernst effect in fluctuating superconductors: Serbyn, Skvortsov, and Varlamov reply

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