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

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

2009-11-11

arxiv.org/abs/0911.2107v1

Physics

Condensed Matter

Superconductivity

13 pages, 9 figures, submited to Nature

Scientific paper

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.

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