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首页> 外文会议>IEEE Toronto International Conference on Science and Technology for Humanity >Resistive layers formation during the superconductor-normal transition of high-T_c superconductors
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Resistive layers formation during the superconductor-normal transition of high-T_c superconductors

机译：在高T_C超导体的超导体正常转换期间形成电阻层

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摘要

The formation of layers during the resistive transition of granular high-T_c superconductors, characterized by either weak (YBCO-like) or strong (MgB_2-like) links, occurs through a series of avalanche-type current density rearrangements. These resistive layers cross the whole specimen approximately orthogonal to the current density direction, and are due to the simultaneous transition of a large number of weak-links or grains. In the present work, strongly and weakly linked networks of nonlinear resistors, with Josephson junction characteristics are considered. It is shown that the exact solution of the Kirchhoff equations yields the subsequent formation of resistive layers within the superconductive matrix as temperature increases. Furthermore, the resistive layer formation process is related to the voltage noise observed at the transition. At the end of the transition, as experimentally found, the layers mix-up, the step amplitude decreases and the resistance curve smoothes. The approach can be extended to networks with arbitrary size and, thus, to real specimens.
机译：在粒状高T_C超导体的电阻过渡期间的层形成，其特征在于弱（YBCO样）或强（MGB_2类似）链路，通过一系列雪崩型电流密度重排发生。这些电阻层通过与电流密度方向大致正交的整个样本交叉，并且由于大量弱链路或晶粒的同时过渡。在本作的工作中，考虑了具有约瑟夫森结特特征的强烈和弱弱的非线性电阻网络。结果表明，Kirchhoff方程的精确溶液产生后续形成超导基质内的电阻层随着温度升高。此外，电阻层形成过程与在过渡时观察到的电压噪声有关。在过渡结束时，如实验发现，层混合，台阶幅度降低，电阻曲线平滑。该方法可以扩展到具有任意尺寸的网络，从而扩展到真实标本。

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