Bi(2223)/Ag带超导电流的特性

Superconducting Current Properties in Bi(2223)/Ag Tape

介绍了关于Bi(2223)/Ag带超导电流的特性,包括本征钉扎,Ic与Lorentz力大小的关系,Ic的磁滞。也就是说,Ic的大小不仅与磁场的历史有关,而且与样品在磁场中取向的历史也有关。提出了Ic磁滞的物理解释。评述了Bi(2223)/Ag带中导电的各种模型,包括砖墙模型、铁路道岔模型和自由流通模型。最后指出提高超导电流密度的可能途径。

Some Cirtical Current properties of Bi(2223)/Ag tapes are described briefly. They are including intrinsic pinning, relations between Ic and Lorentz force, Ic magnetic hysteresis. We found that the Ic are not only dependent on the history of the magnetic field strength but also dependent on the history of magnetic field orientation. A physical explanation of Jc hysteresis is proposed. The models for supercurrent channel within the Bi(2223)/Ag tapes are reviewed. These models are including brick wall model, rail way switch model and free way model. Some methods for increasing Ic of Bi(2223)/Ag tape are discussed.