%0 Journal Article
%K yttrium compounds
%K High temperature superconductors
%K Superconducting materials
%K Electronic properties
%K Ceramic materials
%K Yttrium barium copper oxides
%K Oxide superconductors
%K Gold and Alloys
%K Silver and Alloys
%K Proximity Tunneling Spectroscopy
%A L.H Greene
%A J.B Barner
%A W.L Feldmann
%A L.A Farrow
%A P.F Miceli
%A Ramamoorthy Ramesh
%A B.J Wilkens
%A B.G Bagley
%A J.M Tarascon
%A J.H Wernick
%A M Giroud
%A J.M Rowell
%B Physica C: Superconductivity and its applications
%D 1989
%G eng
%P 1069-1070
%R 10.1016/0921-4534(89)90597-2
%T Studies of proximity-effect and tunneling in YBCO/metal layered films
%V 162-164
%X The short coherence length of the high-Tc superconductors, coupled with their tendency to form non-superconducting surface layers, accounts for the difficulty in achieving good tunnel junctions. A proximity layer of a longer coherence length normal metal (N) is expected to "draw out" Cooper pairs. Our goal is to fabricate reproducible, planar tunnel junctions of SNIS layered structures for proximity tunneling spectroscopy. Such structures of YBCO/N/I/Pb and SNS structures of YBCO/N/Pb indicate that the normal metal produces a low resistance contact to the YBCO surface with a supercurrent observed in the SNS. The insulating barrier in the SNIS is reproducible, insulating and continuous: A sharp Pb gap and phonons from the counter-electrode are routinely observed. © 1989.