Effect of thickness reduction on vortex-glass transition temperature in YBa2Cu3O7-delta thin films

Akihito Sawa; Yasunori Mawatari; Haruhiko Obara; Hirofumi Yamasaki; Masaichi Umeda; Shin Kosaka; Shigeru Hayashi

doi:10.1117/12.250240

5 July 1996 Effect of thickness reduction on vortex-glass transition temperature in YBa₂Cu₃O_7-δthin films

Akihito Sawa, Yasunori Mawatari, Haruhiko Obara, Hirofumi Yamasaki, Masaichi Umeda, Shin Kosaka, Shigeru Hayashi

Proceedings Volume 2697, Oxide Superconductor Physics and Nano-Engineering II; (1996) https://doi.org/10.1117/12.250240
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We investigated the current-voltage characteristics and critical scaling behavior in c-axis oriented YBa₂Cu₃O_7-(delta ) (YBCO) films whose thicknesses are from 18 nm to 230 nm, in magnetic fields applied perpendicular to the film surface. The vortex-glass transition temperature (T_g) decreased as the thickness decreased, and wide temperature critical scaling region was observed in thinner films. We note that the reduction of T_g is similar to the reported result of the vortex-glass transition of narrow YBCO strip lines, and that wide temperature critical scaling region was also observed in the vortex-glass transition of Bi₂Sr₂Ca₂Cu₃O_x (Bi-2223) films. From the analogy to the study of Bi-2223 films, we suggest that, in the thinner YBCO films, the vortex-glass correlation length parallel to the c-axis (xi) _g// is limited by the film thickness, and that wide critical scaling region originates from the enhanced thermal fluctuation effect brought by the reduced correlation volume through the interruption of vortex correlation along c-axis.

Citation Download Citation

Akihito Sawa, Yasunori Mawatari, Haruhiko Obara, Hirofumi Yamasaki, Masaichi Umeda, Shin Kosaka, and Shigeru Hayashi "Effect of thickness reduction on vortex-glass transition temperature in YBa₂Cu₃O_7-δthin films", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); https://doi.org/10.1117/12.250240

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