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    Title: Direct Lorentz force measurement for YBa2Cu3O7-δ superconductor
    Authors: Chan, W.C.;Chiang, C.H.;Hsu, Y.J.
    Contributors: 淡江大學物理學系
    Keywords: Lorentz force;YBCO superconductor;Meissner effect;Flux pinning
    Date: 2010-03
    Issue Date: 2011-10-24 11:05:14 (UTC+8)
    Abstract: This study introduced a novel method using a modified helium gas closed cycle cryogenic system to measure the force acting on a C-shaped magnet by a YBCO superconductor with bias current as a function of temperature. The results showed that the measured force agrees with Lorentz force due to the bias current for normal conductor at temperature higher than the superconducting transition temperature, as expected. However, under a temperature at the beginning of the superconducting transition region, the measured force became larger than the expected Lorentz force. As temperature further decreased, the measured force gradually dropped to zero. A qualitative argument based on the Bean’s model was given to explain the peak in the measured force at the beginning of the transition temperature.
    Relation: cryogenics 50(4), pp.292-294
    DOI: 10.1016/j.cryogenics.2010.01.002
    Appears in Collections:[物理學系暨研究所] 期刊論文

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