Jpn. J. Appl. Phys. 27 (1988) pp. L668-L669 |Next Article| |Table of Contents|
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Letter
Upper Critical Field of New Oxide Superconductor Bi-Sr-Ca-Cu-O
Hiroaki Kumakura,
Hitoshi Shimizu,
Kazuhiko Takahashi,
Kazumasa Togano and
Hiroshi Maeda
National Research Institute for Metals
(Received February 22, 1988; accepted for publication March 22, 1988)
The upper critical field Hc2 of Bi-Sr-Ca-Cu-O superconducting material, with a resistive transition above 100 K, was investigated by observing variations in resistivity with temperature down to 50 K and with magnetic fields up to 12 T. The slope of the critical field, the change in Hc2 with temperature, was -1.5 T/K for the midpoint of the transition. The values of Hc2 at 77 K and 0 K were estimated by extrapolation to be 41 T and 108 T, respectively.
URL:
http://jjap.jsap.jp/link?JJAP/27/L668/
DOI: 10.1143/JJAP.27.L668
KEYWORDS:oxide superconductor, Bi-Sr-Ca-Cu-O, upper critical field, coherence length, Ginzburg-Landau parameter
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