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arXiv 0912.2654cond-mat.supr-concond-mat.mtrl-sci
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超导薄带中的自场:对涂层导体中厚度效应的影响

Self-fields in thin superconducting tapes: implications to the thickness effect in coated conductors

Alvaro Sanchez, Carles Navau, Nuria Del-Valle, Du-Xing Chen

摘要:

超导体的大多数应用,如输电线路、电动机、发电机和Transformers,都需要长电缆,大电流通过长电缆流通。近年来,在基于高温超导体的导体的载流能力方面取得了令人瞩目的进展。涂层导体可能是最好的例子,包括在金属带上生长的质量非常好的YBCO超导体薄层和一些中间层。然而,有一个重要的问题,以实现大电流:一个大的减少,在运输临界电流密度Jc时,增加膜厚已被观察到在涂层导体由所有可用的技术。在这里,我们从理论上解释了这种所谓的厚度效应的性质和无处不在的存在,通过分析在超导体中的传输电流所产生的自场,假设一个现实的场依赖Jc。这些知识可以帮助找到新的方法来提高厚超导膜中的传输电流。

英文摘要:

Most applications of superconductors, such as power transmission lines, motors, generators, and transformers, require long cables through which large currents circulate. Impressive progress has recently been achieved in the current-carrying capability in conductors based on high-temperature superconductors. Coated conductors are likely the best examples, consisting of very good quality thin layers of YBCO superconductor grown on top of a metallic tape with some intermediate layers. However, there is an important problem for achieving large currents: a large decrease in transport critical-current density Jc when increasing film thickness has been observed in coated conductors made by all available techniques. Here, we theoretically explain the nature and the ubiquitous presence of this so-called thickness effect by analyzing the self-field created by the transport currents in the superconductor, assuming a realistic field-dependent Jc. This knowledge can help finding new ways to improve transport current in thick superconducting films.

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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