Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect

Details Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect

2003-01-16

arxiv.org/abs/cond-mat/0301288v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.90.207005

We have measured Andreev reflections between an Au tip and Y_{1-x}Ca_{x}Ba_{2}Cu_{3}O_{7 - \delta} thin films in the in-plane orientation. The conductance spectra are best fitted with a pair potential having the "d_{x^{2}-y^{2}+is" symmetry. We find that the amplitude of the "is" component is enhanced as the contact transparency is increased. This is an indication for an unusual proximity effect that modifies the pair potential in the superconductor near the surface with the normal metal.

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