Studies of proximity-effect and tunneling in YBCO/metal layered films

Publication Type

Journal Article

Authors

DOI

Abstract

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.

Journal

Physica C: Superconductivity and its applications

Volume

162-164

Year of Publication

1989

ISSN

09214534

Notes

cited By 18

Research Areas