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arXiv 0911.2107cond-mat.supr-con
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YBCO界面的超导电性增强:层状超导体中高临界温度的起源

Enhanced superconductivity of YBCO interfaces: origin of high critical temperature in layered superconductors

S. S. Tinchev

摘要:

用电感法测量了YBCO薄膜表面和YBCO薄膜/衬底界面的超导转变温度Tc。据观察,界面- Tc总是高于表面- Tc。然而,银覆盖层的沉积提高了超导转变温度。四点电阻测量证实了这一观察结果。在退火的YBCO/Ag双层膜中观察到界面的磁性。我们认为,这种现象是分层系统的共同特征。这种二维结构使人想起了高温超导体的层状微结构,并且人们可以假设,通常用非超导层覆盖超导层是获得高临界温度的条件。

英文摘要:

Superconducting transition temperatures Tc of the YBCO film surface and of the YBCO film/substrate interface were measured inductively. It was observed that the interface- Tc is always higher then the surface - Tc. However deposition of silver over-layer enhances the superconducting transition temperatures. This observation was confirmed by four-point resistance measurements. In the annealed YBCO/Ag bilayers magnetic properties of the interface were observed. We believe that such phenomena are a common feature of layered systems. This two dimensional structure reminds the layered microstructure of the high-temperature superconductors and one can suppose that covering of the superconducting layer by non-superconducting layer is a condition for obtaining high critical temperatures in general.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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