Correlation of current-voltage characteristics of step-edge YBa2Cu3O7 Josephson junctions with the step angle

K. Herrmann; Michael Siegel; Gerhard Kunkel; A. Thust; B. Kabius; C. L. Jia; Juergen Schubert; Alex I. Braginski

doi:10.1117/12.181010

2 July 1994 Correlation of current-voltage characteristics of step-edge YBa₂Cu₃O₇ Josephson junctions with the step angle

K. Herrmann, Michael Siegel, Gerhard Kunkel, A. Thust, B. Kabius, C. L. Jia, Juergen Schubert, Alex I. Braginski

Author Affiliations +

Proceedings Volume 2160, Superconductive Devices and Circuits; (1994) https://doi.org/10.1117/12.181010
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We report on a systematic study of the transport characteristics of YBa₂Cu₃O₇ (YBCO) step-edge Josephson junctions as a function of the step angle. The microstructure of a YBCO film depends very critically on the step angle (alpha) in a SrTiO₃ or LaAlO₃ substrate. Briefly, on shallow steps (0 < (alpha) < 44 degree(s)) the film grows epitaxially across the step. On steep steps (46 degree(s) < (alpha) < 85 degree(s)) two grain boundaries occur on the step. In this paper it is shown that the I-V curves of the step-edge junction reflect the microstructure of the YBCO film on the step. The I-V curves on shallow steps are of flux-flow type. On 45 degree(s) steps there are several Josephson junctions with different critical currents, while on steep steps two critical currents are found in the I-V curve. Summarizing all data, we conclude that the grain boundaries formed on steep steps are responsible for the Josephson behaviour of the junctions.

Citation Download Citation

K. Herrmann, Michael Siegel, Gerhard Kunkel, A. Thust, B. Kabius, C. L. Jia, Juergen Schubert, and Alex I. Braginski "Correlation of current-voltage characteristics of step-edge YBa₂Cu₃O₇ Josephson junctions with the step angle", Proc. SPIE 2160, Superconductive Devices and Circuits, (2 July 1994); https://doi.org/10.1117/12.181010

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available