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Preparation and critical current density of a Bi‐based superconducting whisker composite

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6 Author(s)
Funahashi, Ryoji ; Osaka National Research Institute, AIST, Midorigaoka, Ikeda, Osaka 563, Japan ; Matsubara, Ichiro ; Kusumi, Shinji ; Ogura, Toru
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A Bi2Sr2CaCu2Ox (Bi‐2212) superconducting whisker composite consisting of Bi‐2212 powder and Bi‐2212 superconducting whiskers has been prepared. The powder and the whiskers have been prepared separately, mixed at a weight ratio of 1.0/0.05 (powder/whisker), and sintered in air. The ab plane of the whisker tends to be aligned parallel to the pressed plane in the composite. Zero resistivity temperature ( Tc,zero) for the composite is 75 K and critical current density (Jc) is 250 A/cm2 at 71 K under zero magnetic field. This value is about ten times larger than for a sintered sample without the whiskers (Tc,zero = 74 K). The reason for the increase in Jc is that the whiskers act as bypasses for superconducting current.

Published in:

Journal of Applied Physics  (Volume:76 ,  Issue: 8 )

Date of Publication:

Oct 1994

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