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arXiv 0704.0494cond-mat.supr-concond-mat.mtrl-sci
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分形团簇结构超导体电阻转变初期的涡旋动力学

Vortex Dynamics at the Initial Stage of Resistive Transition in Superconductors with Fractal Cluster Structure

Yuriy I. Kuzmin

摘要:

本文研究了分形正相团簇对超导体中涡旋动力学的影响。该超导体包含有携带输运电流的超导团簇和作为钉扎中心的正相团簇。这种结构的原型是YBCO膜,包含柱状缺陷的集群,以及BSCCO/Ag护套带,这是线制造的实际利益。超导体转变为电阻态对应于当涡旋自由移动时从钉扎涡旋态到电阻态的渗透转变。得到了自由涡密度与团簇边界分形维数的关系以及自由涡电阻与输运电流的关系。结果表明,在所涉及的超导系统中实现了涡旋玻璃型的混合态。得到了含分形团簇超导体的电流-电压特性,并对其特性进行了研究。

英文摘要:

The effect of fractal normal-phase clusters on vortex dynamics in a percolative superconductor is considered. The superconductor contains percolative superconducting cluster carrying a transport current and clusters of a normal phase, acting as pinning centers. A prototype of such a structure is YBCO film, containing clusters of columnar defects, as well as the BSCCO/Ag sheathed tape, which is of practical interest for wire fabrication. Transition of the superconductor into a resistive state corresponds to the percolation transition from a pinned vortex state to a resistive state when the vortices are free to move. The dependencies of the free vortex density on the fractal dimension of the cluster boundary as well as the resistance on the transport current are obtained. It is revealed that a mixed state of the vortex glass type is realized in the superconducting system involved. The current-voltage characteristics of superconductors containing fractal clusters are obtained and their features are studied.

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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