Transport critical-current and voltage-current characteristics of Bi(2223) silver-clamped thick films |
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Authors: | Guchang Han Yugui Wang Hanmin Han Zhihe Wang Shunxi Wang Weifan Yuan Qiaolin Huang Zhiming Liu Jinlin Chen |
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Institution: | (1) Institute of Plasma Physics, Academia Sinica, P.O.Box 1126, 230031 Hefei, People's Republic of China |
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Abstract: | The transport critical current properties of Bi(2223) silver-clamped thick films are studied by the measurement of its dependence on magnetic field and temperature close to T
c. It is found that the transport critical current follows a power law J
c(1–T/T
c)3/2 for the sample with J
c>2.0×104 A/cm2 (77K, zero field) and that J
c(H) is basically reversible for increasing and decreasing magnetic field. After the transport current exceeds the critical current, the voltage-current (V-I) characteristics show a flux-creep-like behaviour until they smoothly join the flux-flow state. From the measurement of V-I curves, the pinning property of the sample may be estimated using the flux-creep mode. The flux-flow resistance is found to have a nonlinear magnetic field dependence. |
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Keywords: | 74 60 Jg |
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