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We report on Josephson and quasiparticle tunneling in YBa2Cu3O7-x(YBCO)/Au/Nbramp junctions of several geometries. Macroscopically, tunneling occurs in theab-plane of YBCO either in the (100) and (010) direction, or in the (110)direction. These junctions have a stable and macroscopically well definedgeometry. This allows systematic investigations of both quasiparticle andJosephson tunneling over a wide range of temperature and magnetic field. WithNb superconducting, its gap appears in the quasiparticle conductance spectra asNb coherence peaks and a dip at the center of a broadened zero-bias conductancepeak (ZBCP). As we increase the temperature or an applied magnetic field boththe Nb coherence peaks and the dip get suppressed and the ZBCP fully develops,while states are conserved. With Nb in the normal state the ZBCP is observed upto about 77 K and is almost unaffected by an increasing field up to 7 T. Themeasurements are consistent with a convolution of density of states withbroadened Andreev bound states formed at the YBCO/Au/Nb junction interfaces.Since junctions with different geometries are fabricated on the same substrateunder the same conditions one expects to extract reliable tunneling informationthat is crystallographic direction sensitive. In high contrast to Josephsontunneling, however, the quasiparticle conductance spectra are crystallographicorientation insensitive: independent whether the tunneling occurs in the (100)or (110) directions, a pronounced ZBCP is always observed, consistent withmicroscopic roughness of the junction interfaces. Qualitatively, all theseparticularities regarding quasiparticle spectra hold regardless whether theYBCO thin film is twinned or untwinned.Comment: 13 pages, 10 figure

physical review. b, condensed matter and materials physics

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