Surface impedance of type-II superconductors is determined by their local optical conductivity $\sigma \left(\omega \right)$. Standard BCS-like theoretical descriptions of $\sigma \left(\omega \right)$, due to Mattis and Bardeen [Phys. Rev. 111, 412 (1958)] or Zimmermann et al. [Physica C 183, 99 (1991)], do not take pair-breaking processes into account. Therefore they do not provide a quantitative explanation of the microwave response, and in particular, they cannot predict the magnitude of the coherence peak. Here, based on the recently developed concept of Dynes superconductors, which does take also the pair-breaking scattering into account, we provide a simple but complete description of the microwave response of type-II superconductors, concentrating on the unexpected properties of clean superconductors which are often used as cavity materials.

中文翻译：

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服从局部电动力学的超导体的微波响应

II 型超导体的表面阻抗由它们的局部光导率决定 $\sigma \left(\omega \right)$. 标准的类似 BCS 的理论描述$\sigma \left(\omega \right)$, 由于马蒂斯和巴丁 [ Phys. Rev. 111 , 412 (1958)] 或 Zimmermann等人。[ Physica C 183 , 99 (1991)]，不考虑破对过程。因此，它们没有提供微波响应的定量解释，特别是，它们无法预测相干峰的大小。在这里，基于最近开发的达因超导体概念，该概念也考虑了对断裂散射，我们提供了对 II 型超导体的微波响应的简单但完整的描述，集中在清洁超导体的意想不到的特性上常用作腔体材料。