Weak links in proximity-superconducting two-dimensional electron systems
N. B. Kopnin, A. S. Mel'nikov, I. A. Sadovskyy, V. M. Vinokur
DOI 10.1103/PhysRevB.89.081402 · Physical Review B
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Abstract
We find a giant inverse proximity effect that arises in small low-dimensional superconductor-normal-superconductor (S/N/S) junctions, where a proximity coherence length is larger than the coherence length of a source superconductor, due to a huge backaction exerted by normal conductors on the proximity superconducting regions. Inverse proximity develops even in case where dimensions of the normal parts are smaller than the proximity coherence length and significantly suppresses superconducting characteristics of the entire system, including critical current, well below those for the usual S/N/S structures.
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