Josephson tunneling in high-Tc superconductors

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

doi:10.1117/12.241749

10 June 1996 Josephson tunneling in high-Tc superconductors

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

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241749
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Investigation of the overlap of the pair wavefunction of a conventional superconductor with that of a high T_c 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 d_x2-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 I_c(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.

Citation Download Citation

Adrian G. Sun, A. S. Katz, Andrew G. Truscott, Robert C. Dynes, D. A. Gajewski, S. H. Han, Boyd W. Veal, C. Gu, and M. Brian Maple "Josephson tunneling in high-Tc superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241749

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