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An intrinsic gap depression at the Superconductor-Insulator interface due tothe very short value of the coherence length in High-Tc Superconductors [HTSs]is considered, in the framework of a mixed (s+id)-wave pair symmetry for theorder parameter ranging from pure s to pure d-wave. This gap depression acts asthe main physical agent causing the relevant reduction of IcRn(T) values withrespect to BCS expectations in HTS SIS Josephson junctions. Good agreement withvarious experimental data is obtained with both pure s-wave and pure d-wavesymmetries of the order parameter, but with amounts of gap depression dependingon the pair symmetry adopted. Regardless of the pair symmetry considered, theseresults prove the importance of the surface order-parameter depression in thecorrect interpretation of the Ic(T)Rn(T) data in HTS SIS junctions. In a caseof planar YBCO-based junction the use of the de Gennes condition allowed us totentatively obtain an upper limit for the amount of d-wave present in the orderparameter of YBCO.Comment: 11 pages REVTeX file, 6 PostScript figures, to be published in J.  Superconductivit

journal of superconductivity

Intrinsic surface depression of the order parameter under mixed (s+id)-wave pair symmetry and its effect on the critical current of high-T c SIS Josephson junctions