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arXiv 0706.4040cond-mat.supr-concond-mat.mtrl-sci
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$YBa_2Cu_3O_{6+x}$涂层导体中的正常区

Normal zone in $YBa_2Cu_3O_{6+x}$-coated conductors

George A. Levin, Paul N. Barnes

摘要:

我们考虑的电场的分布在YBCO涂层导体的情况下,其中的直流传输电流被迫进入铜稳定器由于一个薄弱环节-一段超导膜的临界电流小于传输电流。对金属衬底中的电场也进行了讨论。结果进行了比较,与最近的实验正常区传播的涂层导体的基板和稳定剂是彼此绝缘。基底和稳定剂之间的电势差以及基底中在正常区之外的电场可以由基底中的大屏蔽长度(与样品的长度相当)来解释。在淬火期间,YBCO和稳定剂之间的界面内以及缓冲层中的电场可以比正常区域内的纵向宏观电场大几个数量级。我们推测使用可能的微观放电所造成的这种大($\sim $ kV/cm)电场作为一种手段来检测淬火的可能性。

英文摘要:

We consider the distribution of an electric field in YBCO-coated conductors for a situation in which the DC transport current is forced into the copper stabilizer due to a weak link -- a section of the superconducting film with a critical current less than the transport current. The electric field in the metal substrate is also discussed. The results are compared with recent experiments on normal zone propagation in coated conductors for which the substrate and stabilizer are insulated from each other. The potential difference between the substrate and stabilizer, and the electric field in the substrate outside the normal zone can be accounted for by a large screening length in the substrate, comparable to the length of the sample. During a quench, the electric field inside the interface between YBCO and stabilizer, as well as in the buffer layer, can be several orders of magnitude greater than the longitudinal macroscopic electric field inside the normal zone. We speculate on the possibility of using possible microscopic electric discharges caused by this large ($\sim $kV/cm) electric field as a means to detect a quench.

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