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Jpn. J. Appl. Phys. 44 (2005) pp. L246-L248  |Previous Article| |Next Article|  |Table of Contents|
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Letter

Critical Current Control in YBa₂Cu₃O_7-δ Films Using Artificial Pinning Centers

Kaname Matsumoto^1,6,, Tomoya Horide^1,6, Ataru Ichinose^2,6, Shigeru Horii^3,6, Yutaka Yoshida^4,6 and Masashi Mukaida^5,6

¹Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
²Central Research Institute of Electric Power Industry, Yokosuka 240-0196, Japan
³Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
⁴Department of Energy Engineering and Science, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
⁵Department of Electrical and Information Engineering, Yamagata University, Yonezawa 992-8510, Japan
⁶CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan

(Received October 26, 2004; accepted December 16, 2004; published January 28, 2005)

High-temperature superconductors can carry high non dissipative currents at low temperatures as long as quantized vortices are pinned. However, the currents in a magnetic field at liquid nitrogen temperature (77 K) are not sufficiently high for practical use due to the weak pinning. For the improvement of nondissipative currents in YBa₂Cu₃O_7-δ films, linear defects that extended to the c-axis of the film were introduced using a novel nanostructure technology. We observed a marked enhancement of the nondissipative currents even at 77 K and high fields when the fields were applied close to the c-axis. This is a clear demonstration of enhanced pinning using artificially incorporated pinning centers.

URL: http://jjap.jsap.jp/link?JJAP/44/L246/
DOI: 10.1143/JJAP.44.L246

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