Nernst effect in the phase-fluctuating superconductor InO${}_x$

Abstract

We present a study of the Nernst effect in amorphous 2D superconductor InO${}_x$, whose low carrier density implies low phase rigidity and strong superconducting phase fluctuations. Instead of presenting the abrupt jump expected at a BCS transition, the Nernst signal evolves continuously through the superconducting transition as previously observed in underdoped cuprates. This contrasts with the case of Nb${}_{0.15}$Si${}_{0.85}$, where the Nernst signal due to vortices below T${}_c$ and by Gaussian fluctuations above are clearly distinct. The behavior of the ghost critical field in InO${}_x$ points to a correlation length which does not diverge at $T_c$, a temperature below which the amplitude fluctuations freeze, but phase fluctuations survive.

4 pages, 4 figures

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• Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi
• Charge Berezinskii-Kosterlitz-Thouless transition in superconducting NbTiN films
• Observation of the ghost critical field for superconducting fluctuations in a disordered TaN thin film
• Quantum criticality at the superconductor insulator transition probed by the Nernst effect
• Universal bound to the amplitude of the vortex Nernst signal in superconductors
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• AC Measurement of the Nernst effect of thin films at low temperatures
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• Theoretical Analysis of Drag Resistance in Amorphous Thin Films Exhibiting Superconductor-Insulator-Transition
• Nernst effect and its thickness dependence in superconducting NbN films
• Nernst Effect as a Signature of Quantum Fluctuations in Quasi-1D Superconductors
• Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor
• Nernst Plateau in the Quantum Limit of Low-Carrier-Density Topological Insulators