脉冲磁场下高温超导体action弛豫现象的研究
Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7-d at the action of pulsed magnetic fields
摘要：
本文采用Abrikosov涡旋受激动力学的力学方法研究了超导体的动力学。利用它研究了高温超导体中涡旋物质的弛豫现象。它确定了脉冲磁场改变了涡旋物质中发生的弛豫过程的过程。研究了脉冲磁场对各向同性高温超导体HoBa_2Cu_3 O_（7-d）涡旋系统的影响，发现了阈值现象的存在。小的持续时间的脉冲不会改变松弛过程发生在涡旋物质的过程。当脉冲持续时间超过某个临界值（阈值）时，它们的影响改变了弛豫过程的进程，这通过弛豫机械矩的逐步变化来揭示。这些研究表明，在HoBa_2Cu_3 O_（7-d）中形成Abrikosov涡旋晶格的时间为20微秒量级。其值的数量级超过了在II型超导体中观察到的单个涡旋形成所需的时间。
英文摘要：
It is used the mechanical method of Abrikosov vortex stimulated dynamics investigation in superconductors. With its help it was studied relaxation phenomena in vortex matter of high-temperature superconductors. It established that pulsed magnetic fields change the course of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing by their durations and amplitudes on vortex system of isotropic high-temperature superconductors system HoBa2Cu3O7-d showed the presence of threshold phenomena. The small duration pulses does not change the course of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence change the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment . These investigations showed that the time for formatting of Abrikosov vortex lattice in HoBa2Cu3O7-d is of the order of 20 microsec. which on the order of value exceeds the time necessary for formation of a single vortex observed in type II superconductors.
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