Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 25 August 1989:
Vol. 245. no. 4920, pp. 839 - 841
DOI: 10.1126/science.245.4920.839
Prev | Table of Contents | Next

Articles

Spatially Resolved Observation of Supercurrents Across Grain Boundaries in YBaCuO Films

J. MANNHART 1, R. GROSS 1, K. HIPLER 1, R. P. HUEBENER 1, C. C. TSUEI 1, D. DIMOS 1, and P. CHAUDHARI 1

1 Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universität Tübingen, D-7400 Tübingen, Federal Republic of Germany.

Spatially resolved resistivity measurements of current transport across individual grain boundaries have been made on superconducting YBa2Cu3O7. These experiments were done by low-temperature scanning electron microscopy with a resolution of 1 to 2 micrometers, and they show directly the limitation of the critical current density caused by grain boundaries in YBa2Cu3O7. Furthermore, complex spatial patterns of the current transport across grain boundaries were observed. These patterns reflect self-excited resonances of the grain boundaries and are closely correlated to the unexplained "sub-gap structure" in the current-voltage characteristics of polycrystalline YBa2Cu3O7.

Submitted on May 3, 1989
Accepted on June 20, 1989


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Spatially Resolved Observation of Static Magnetic Flux States in YBa2Cu3O7-dgr Grain Boundary Josephson Junctions.
G. M. Fischer, B. Mayer, R. Gross, T. Nissel, K. -D. Husemann, R. P. Huebener, T. Freltoft, Y. Shen, and P. Vase (1994)
Science 263, 1112-1114
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)