Quantum-fluctuation effects in the transport properties of ultrathin films of disordered superconductors above the paramagnetic limit

M. Khodas*, A. Levchenko, G. Catelani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We study the transport in ultrathin disordered film near the quantum critical point induced by the Zeeman field. We calculate corrections to the normal state conductivity due to quantum pairing fluctuations. The fluctuation-induced transport is mediated by virtual rather than real quasiparticle excitations. We find that at zero temperature, where the corrections come from purely quantum fluctuations, the Aslamazov-Larkin paraconductivity term, the Maki-Thompson interference contribution, and the density of states effects are all of the same order. The total correction leads to the negative magnetoresistance. This result is in qualitative agreement with the recent transport observations in the parallel magnetic field of the homogeneously disordered amorphous films and superconducting two-dimensional electron gas realized at the oxide interfaces.

Original languageAmerican English
Article number257004
JournalPhysical Review Letters
Volume108
Issue number25
DOIs
StatePublished - 20 Jun 2012
Externally publishedYes

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