Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors

Details Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors

2009-10-13

arxiv.org/abs/0910.2451v1

Phys. Rev. Lett. 104, 047003 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

We have found experimentally that the critical current of a square superconducting transition-edge sensor (TES) depends exponentially upon the side length L and the square root of the temperature T. As a consequence, the effective transition temperature Tc of the TES is current-dependent and at fixed current scales as 1/L^2. We also have found that the critical current can show clear Fraunhofer-like oscillations in an applied magnetic field, similar to those found in Josephson junctions. The observed behavior has a natural theoretical explanation in terms of longitudinal proximity effects if the TES is regarded as a weak link between superconducting leads. We have observed the proximity effect in these devices over extraordinarily long lengths exceeding 100 um.

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