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

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 quasi-particles. 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.

arXiv comment4+ pages, 1 figure

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Cited by in corpus (5)

• Superconductor-insulator transitions: Phase diagram and magnetoresistance
• Fluctuation conductivity of disordered superconductors in magnetic fields
• Anomalous mesoscopic kinetics in disordered superconductors
• Transport anomalies in multiband superconductors near quantum critical point
• Percolative supercurrent in superconductor-ferromagnetic insulator bilayers