Journal
PHYSICAL REVIEW LETTERS
Volume 90, Issue 20, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.90.207005
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We have measured Andreev reflections between an Au tip and Y1-xCaxBa2Cu3O7-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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