Observation of the Kosterlitz-Thouless transition in superconducting YBa2Cu3O7−x thin films

✍ Scribed by Hidekazu Teshima; Katsumi Ohata; Hirohiko Izumi; Koichi Nakao; Tadataka Morishita; Shoji Tanaka

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 185 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91058-c

✦ Synopsis

Current-Voltage characteristics of c-axis oriented thin films of YBa2Cu307-x exhibit a power-law dependence with Vo~ICt(T) near the superconducting transition temperature Tc0. The exponent ¢x(T) shows a "universal jump" from 3 to 1 at the Kosterlitz-Thouless transition temperature TKT. The difference between TRT and Tc0 is 0.23K, which is in reasonable agreement with the theory. The result demonstrates that vortex-antivortex pair excitations occur in the entire film, not in the individual Cu-O planes.