Josephson current noise above Tc in superconducting tunnel junctions

Abstract

Tunnel junction between two superconductors is considered in the vicinity of the critical temperature. Superconductive fluctuations above Tc give rise to the noise of the ac Josephson current although the current itself is zero in average. As a result of fluctuations, current noise spectrum is peaked at the Josephson frequency, which may be considered as precursor of superconductivity in the normal state. Temperature dependence and shape of the Josephson current noise resonance line is calculated for various junction configurations.

8 pages, 2 figures

References in corpus (5)

• Electron--electron Interactions in Disordered Metals: Keldysh Formalism
• Keldysh action for disordered superconductors
• Keldysh Ginzburg-Landau action of fluctuating superconductors
• Probing Pseudogap by Josephson Tunneling
• Probing superconducting phase fluctuations from the current noise spectrum of pseudogaped metal-superconductor tunnel junctions

Cited by in corpus (6)

• Keldysh technique and non-linear sigma-model: basic principles and applications
• Nonequilibrium noise and current fluctuations at the superconducting phase transition
• Fluctuational Anomalous Hall and Nernst Effects in Superconductors
• Fluctuation-driven excess noise near superconducting phase transition
• Resonant tunneling of fluctuation Cooper pairs
• Incoherent pair tunneling in the pseudogap phase of cuprates