Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect

A. Kohen; G. Leibovitch; G. Deutscher

doi:10.1103/PhysRevLett.90.207005

Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect

Superconductivity 2009-11-10 v1

Authors: A. Kohen , G. Leibovitch , G. Deutscher

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Abstract

We have measured Andreev reflections between an Au tip and Y_{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" 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.

Keywords

Andreev reflections Y_{1-x}Ca_{x}Ba_2Cu_3O_{7-δ} unusual proximity effect d_{x^2-y^2+is} symmetry pair potential contact transparency

Cite

@article{arxiv.cond-mat/0301288,
  title  = {Andreev reflections on Y1-xCaxBa2Cu3O7-delta evidence for an unusual proximity effect},
  author = {A. Kohen and G. Leibovitch and G. Deutscher},
  journal= {arXiv preprint arXiv:cond-mat/0301288},
  year   = {2009}
}

Comments

4 pages, 4 figures

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