Abstract
When the dx2−y2-wave pairing is suppressed by Zn doping in YBa2Cu3O7−δ, some of the Andreev reflection spectra are found to be similar to the s-wave spectra of conventional superconductors. The energy gap is rather reproducible (2.3–3.0meV). It is suppressed by low magnetic field (HcPC=120–270mT), in great contrast to the d-wave spectra (HcPC>3T) for a similar order of magnitude of the gap. We suppose that the s-wave pairing occurs near the Zn impurities.
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