Josephson current noise above Tc in superconducting tunnel junctions

Details Josephson current noise above Tc in superconducting tunnel junctions Josephson current noise above Tc in superconducting tunnel junctions

2008-09-11

arxiv.org/abs/0809.2109v1

Phys. Rev. B 78, 104507 (2008)

Physics

Condensed Matter

Superconductivity

8 pages, 2 figures

Scientific paper

10.1103/PhysRevB.78.104507

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.

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