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

Details Nernst effect in the phase-fluctuating superconductor InO$_x$ Nernst effect in the phase-fluctuating superconductor InO$_x$

2007-12-17

arxiv.org/abs/0712.2655v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1209/0295-5075/83/57005

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.

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