Yan Xin-Zhong, Ting C S
Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190, People's Republic of China.
J Phys Condens Matter. 2009 Jan 21;21(3):035701. doi: 10.1088/0953-8984/21/3/035701. Epub 2008 Dec 11.
With a simple but exactly solvable model, we investigate the supercurrent transferring through the c-axis cuprate superconductor-normal metal-superconductor junctions with the clean normal metal much thicker than its coherence length. It is shown that the supercurrent as a function of thickness of the normal metal decreases much slower than the exponential decaying expected by the proximity effect. The present result may account for the giant proximity effect observed in the c-axis cuprate SNS junctions.
通过一个简单但可精确求解的模型，我们研究了超电流通过c轴铜酸盐超导体 - 正常金属 - 超导体结的传输情况，其中正常金属很纯净且厚度远大于其相干长度。结果表明，超电流作为正常金属厚度的函数，其下降速度比近邻效应预期的指数衰减要慢得多。目前的结果可能解释了在c轴铜酸盐SNS结中观察到的巨大近邻效应。
