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arXiv 1204.3252cond-mat.supr-con
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第二类超导块材的临界电流密度

The critical current density in type-II superconducting bulk materials

Ming Ju Chou, Wei Yeu Chen

摘要:

基于涡旋动力学的量子理论,研究了第二类常规和高温超导块材的临界电流密度Jc。结果表明,在恒定磁场下,当T<T_dp时,临界电流密度J_c随温度的升高而减小当T_dp< T <T_f(边界涨落温度)时,Jc呈幂律衰减,当T>T_f时,Jc呈指数衰减;而对于恒定温度,Jc先减小,然后在达到最大值后增大,最后随着磁场的增加再次减小。这些结果与实验结果一致。

英文摘要:

The critical current density Jc in type-II conventional and high-Tc superconducting bulk materials is investigated based on the quantum theory for the vortex dynamics. It is shown that for a constant magnetic field, the critical current density Jc decreases weakly with increasing temperature when T<T_dp(depinning temperature); when T_dp< T <T_f (boundary fluctuation temperature,Jc is power-law-decaying,and when T>T_f,Jc decays exponentially; while for a constant temperature, Jc first decreases, then increases after reaching a maximum, and finally decreases again as the magnetic field increases. These results are in agreement with the experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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