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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Cited by in corpus (3)

• The Nernst effect and the boundaries of the Fermi liquid picture
• Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi
• Investigating superconductor-insulator transition in thin films using drag resistance:Theoretical analysis of a proposed experiment