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Proceedings Paper

Josephson and tunneling experiments in in-situ Pb/YBCO junctions
Author(s): Jerome Lesueur; X. Grison; Marco Aprili; S. Jong Kim; J. Ayache
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Paper Abstract

Josephson tunnel junctions between a conventional superconductor (Pb) and a High Tc material YBa2Cu3O7-(delta ) (YBCO) have been reproducibly obtained in a film based planar geometry. Using a quasi-MBE method to grow high quality thin films, and making in-situ Pb/YBCO junctions along different crystallographic orientations, we studied the Josephson coupling along the (001) and (103) directions, together with the excitation spectra through quasi-particle tunneling. We evidenced that the coupling along the c- direction is small but finite, compatible with a small s-wave component in YBCO, and that a Zero Bias Conductance Peak is present when tunneling in the ab-plane, as expected for an Andreev Bound State (ABS) at a surface of a dominantly d-wave superconductor. The role of twin boundaries in c-axis experiments is discussed, and the coupling between the ABS with the Josephson current as well.

Paper Details

Date Published: 22 December 1998
PDF: 10 pages
Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); doi: 10.1117/12.335896
Show Author Affiliations
Jerome Lesueur, Univ. de Paris-Sud (France)
X. Grison, Univ. de Paris-Sud (France)
Marco Aprili, Univ. de Paris-Sud (France)
S. Jong Kim, Univ. de Paris-Sud (France)
J. Ayache, Univ. de Paris-Sud (France)

Published in SPIE Proceedings Vol. 3481:
Superconducting and Related Oxides: Physics and Nanoengineering III
Davor Pavuna; Ivan Bozovic, Editor(s)

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