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Proceedings Paper

Josephson tunneling in high-Tc superconductors
Author(s): Adrian G. Sun; A. S. Katz; Andrew G. Truscott; Robert C. Dynes; D. A. Gajewski; S. H. Han; Boyd W. Veal; C. Gu; M. Brian Maple
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Paper Abstract

Investigation of the overlap of the pair wavefunction of a conventional superconductor with that of a high Tc cuprate should reveal the symmetry of the superconducting order parameter of the cuprate. We have been studying this overlap by Josephson tunneling (tunneling as opposed to SNS or weak link) between conventional superconductors (Pb, Sn) and YBCO. The observation of Josephson coupling in the c direction implies that the order parameter in YBCO is not strictly of dx2-y2 symmetry. We have carried out studies on YBCO in the form of twinned and detwinned single crystals and thin films on various substrates. The magnetic field dependence of the Josephson current Ic(B) allows a direct, dc, and low field measurement of the low temperature penetration depth (lambda) ab. Measurements of (lambda) a and (lambda) b in detwinned single crystals of YBCO give the value of in-plane anisotropy ratio in this material.

Paper Details

Date Published: 10 June 1996
PDF: 6 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241749
Show Author Affiliations
Adrian G. Sun, Univ. of California (United States)
A. S. Katz, Univ. of California/San Diego (United States)
Andrew G. Truscott, Univ. of California/San Diego (United States)
Robert C. Dynes, Univ. of California/San Diego (United States)
D. A. Gajewski, Univ. of California/San Diego (United States)
S. H. Han, Univ. of California/San Diego (United States)
Boyd W. Veal, Argonne National Lab. (United States)
C. Gu, Argonne National Lab. (United States)
M. Brian Maple, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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