Study of the Order Parameter symmetry in overdoped Y1-xCaxBa2Cu3O7-delta by measurement of Andreev reflection, evidence for enhancement of the sub dominant order parameter amplitude in high transparency contacts

A. Kohen, G. Deutscher

We have measured the differential Conductance of Au/Y1-xCaxBa2Cu3O7-delta point contacts in the regime where it is dominated by Andreev reflection, which enhances its value at low…