We report on ultrasmooth surface morphology and chemical activeness of (110)-oriented (YBCO) films grown on (110) YBCO single-crystal substrates by scanning electron microscopy, reflection high-energy electron diffraction, and transmission electron microscopy observations. The stable (110) YBCO interface can be formed by in situ deposited thin Au film against the chemically active elements like Nb. The in situ formed Nb/Au/(110)YBCO junction shows clear two superconducting transitions and associated with YBCO and Nb films and large supercurrent (at least larger than ) much more than expected phenomenological arguments of wave and wave.
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© 1998 American Institute of Physics.
1998
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