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arXiv · 0910.2451

Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors

John E. Sadleir·Stephen J. Smith·Simon R. Bandler·James A. Chervenak·John R. Clem
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Abstract

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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John E. Sadleir, Stephen J. Smith, Simon R. Bandler, James A. Chervenak, John R. Clem. 2009-10-13. Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors. https://doi.org/10.1103/physrevlett.104.047003

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