Josephson and tunneling experiments in in-situ Pb/YBCO junctions

Jerome Lesueur; X. Grison; Marco Aprili; S. Jong Kim; J. Ayache

doi:10.1117/12.335896

22 December 1998 Josephson and tunneling experiments in in-situ Pb/YBCO junctions

Jerome Lesueur, X. Grison, Marco Aprili, S. Jong Kim, J. Ayache

Proceedings Volume 3481, Superconducting and Related Oxides: Physics and Nanoengineering III; (1998) https://doi.org/10.1117/12.335896
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Josephson tunnel junctions between a conventional superconductor (Pb) and a High Tc material YBa₂Cu₃O_7-(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.

Citation Download Citation

Jerome Lesueur, X. Grison, Marco Aprili, S. Jong Kim, and J. Ayache "Josephson and tunneling experiments in in-situ Pb/YBCO junctions", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); https://doi.org/10.1117/12.335896

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