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Phys Rev Lett. 2004 Oct 8;93(15):157002. Epub 2004 Oct 4.

Giant proximity effect in cuprate superconductors.

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Brookhaven National Laboratory, Upton, New York 11973-5000, USA.


Using an advanced molecular beam epitaxy system, we have reproducibly synthesized atomically smooth films of high-temperature superconductors and uniform trilayer junctions with virtually perfect interfaces. We found that supercurrent runs through very thick barriers. We can rule out pinholes and microshorts; this "giant proximity effect" (GPE) is intrinsic. It defies the conventional explanation; it might originate in resonant tunneling through pair states in an almost-superconducting barrier. GPE may also be significant for superconducting electronics, since thick barriers are easier to fabricate.

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