Andreev Reflections on Y1−xCaxBa2Cu3O7−δ: Evidence for an Unusual Proximity Effect

A. Kohen; G. Leibovitch; G. Deutscher

doi:10.1103/PhysRevLett.90.207005

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Andreev Reflections on Y1−xCaxBa2Cu3O7−δ: Evidence for an Unusual Proximity Effect

A. Kohen, G. Leibovitch, G. Deutscher

DOI 10.1103/PhysRevLett.90.207005 · Physical Review Letters

T1

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Abstract

We have measured Andreev reflections between an Au tip and Y1−xCaxBa2Cu3O7−δ thin films in the in-plane orientation. The conductance spectra are best fitted with a pair potential having the dx2−y2+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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y1-xCaxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83	Pressure unresolved	onset
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown