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We have measured Andreev reflections between an Au tip andY_{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" componentis enhanced as the contact transparency is increased. This is an indication foran unusual proximity effect that modifies the pair potential in thesuperconductor near the surface with the normal metal.Comment: 4 pages, 4 figure

physical review letters

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Andreev Reflections onY1−xCaxBa2