界面超导性：新的旧的故事
Interface superconductivity: the new old story
摘要：
近年来，提高LaSrCuO双层材料的超导转变温度引起了人们极大的兴趣。造成这种现象的原因可能是界面超导性，这是金兹伯格在1964年预测的。在传统超导体中已经观察到了类似界面超导的效应。1990年我们观察到高T_c薄膜两侧（界面和表面）的超导临界温度是不同的，并且发现用银覆盖薄膜可以提高T_c。我们的解释是，我们观察到一个界面（表面）增强超导性的界面侧的衬底和表面上的银。在退火的YBCO/Ag双层膜中观察到界面的磁性。不幸的是，我们的两篇论文没有被接受出版，只有SQUID 91会议上发表的论文被出版。19年后的今天，我想展示一些以前未发表的结果，并指出所观察到的现象可能是这种层系的共同特征。
英文摘要：
Recently there is a great excitation about enhancement of the superconducting transition temperature in bilayer LaSrCuO materials. Responsible for this phenomenon is probably the interface superconductivity, predicted by Ginzburg in 1964. The interface-superconductivity-like effects were already observed in conventional superconductors. In 1990 we observed that the superconducting critical temperature of both sides (interface and surface) of the high-Tc films can be different and we have found an enhancement of the Tc if the films are covered with silver. Our interpretation is that we observe an interface (surface) enhanced superconductivity on the interface side by the substrate and on the surface by the silver. In the annealed YBCO/Ag bilayers magnetic properties of the interface were observed. Unfortunately two of our papers were not accepted for publication and only the paper presented on SQUID 91 conference was published. Now after 19 years I would like to show some of these old unpublished results and to point out that the observed phenomena are probably a common feature of such layer systems.
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