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Proceedings Paper

Effect of thickness reduction on vortex-glass transition temperature in YBa2Cu3O7-delta thin films
Author(s): Akihito Sawa; Yasunori Mawatari; Haruhiko Obara; Hirofumi Yamasaki; Masaichi Umeda; Shin Kosaka; Shigeru Hayashi
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Paper Abstract

We investigated the current-voltage characteristics and critical scaling behavior in c-axis oriented YBa2Cu3O7-(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 (Tg) decreased as the thickness decreased, and wide temperature critical scaling region was observed in thinner films. We note that the reduction of Tg 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 Bi2Sr2Ca2Cu3Ox (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.

Paper Details

Date Published: 5 July 1996
PDF: 10 pages
Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250240
Show Author Affiliations
Akihito Sawa, Electrotechnical Lab. (Japan)
Yasunori Mawatari, Electrotechnical Lab. (Japan)
Haruhiko Obara, Electrotechnical Lab. (Japan)
Hirofumi Yamasaki, Electrotechnical Lab. (Japan)
Masaichi Umeda, Electrotechnical Lab. (Japan)
Shin Kosaka, Electrotechnical Lab. (Japan)
Shigeru Hayashi, Chiba Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 2697:
Oxide Superconductor Physics and Nano-Engineering II
Ivan Bozovic; Davor Pavuna, Editor(s)

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