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Thermal diffusion and ac loss in high-T-c superconductors

机译：高T-c超导体的热扩散和ac损耗

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摘要

The influence of thermal diffusion and temperature nonuniform distribution on ac loss of high-temperature superconductors has been investigated. Asymptotic solutions of magnetic and electric fields and ac loss are presented in the form of power series of lambda(h), the normalized frequency of the external ac magnetic field. It reveals that influences of thermal diffusion on the ac loss behavior of high-T-c superconductors include: (i) a weak frequency dependence of ac loss per cycle, i.e., ac loss per cycle increases with frequency in the incomplete field penetration, but decreases with frequency in the complete field penetration; (ii) nonuniform temperature distribution in the sample with the highest temperature located in the center; and (iii) existence of a critical frequency at which the superconductivity is destroyed at the hottest point in the sample. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 6]
机译：研究了热扩散和温度不均匀分布对高温超导体交流损耗的影响。磁场和电场与交流损耗的渐近解以λ（h）的幂级数（外部交流磁场的归一化频率）的形式给出。它揭示了热扩散对高Tc超导体的交流损耗行为的影响包括：（i）每个周期的交流损耗的频率依赖性较弱，即，每个周期的交流损耗随着不完全磁场穿透的频率而增加，但随着频率的增加而减小。完整场穿透的频率; （ii）最高温度位于中心的样品中温度分布不均匀; （iii）在样品的最热点存在破坏超导性的临界频率。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：6]

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