Bozovic I, Logvenov G, Verhoeven M A J, Caputo P, Goldobin E, Beasley M R
Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2004 Oct 8;93(15):157002. doi: 10.1103/PhysRevLett.93.157002. Epub 2004 Oct 4.
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.
利用先进的分子束外延系统，我们可重复地合成了高温超导原子级光滑薄膜以及具有几乎完美界面的均匀三层结。我们发现超电流能穿过非常厚的势垒。我们可以排除针孔和微短路的情况；这种“巨近邻效应”（GPE）是固有的。它不符合传统解释；它可能源于通过几乎超导势垒中的配对态的共振隧穿。由于较厚的势垒更容易制造，GPE对于超导电子学可能也很重要。
