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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
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Abstract

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 bias. We find that the characteristics can not be fitted by a pure d-wave Order Parameter (OP). Using the formalism developed by Kashiwaya and Tanaka[1], the best fits are obtained by adding a sub-dominant imaginary OP, whose amplitude appears to depend on the transparency of the contact. At high transparencies it can reach up to 60% of the total amplitude of the OP. for lower transparencies it is substantially smaller. We attribute this enhancement, at high transparencies to a proximity effect between the Au tip and the superconducting electrode

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A. Kohen, G. Deutscher. 2002-07-16. 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. https://arxiv.org/abs/cond-mat/0207382

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