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Conductivity anisotropy and pseudogap in the microwave response of high-T-c superconductors

机译:高T-c超导体微波响应中的电导率各向异性和拟间隙

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摘要

Results of investigating the temperature dependences of the surface impedance Z(T) = R(T) + iX(T) and complex conductivity sigma (T) = sigma '(T) - i sigma "(T) in the ab-planes and along the c-axis of high-T-c superconductors (HTSCs) are reviewed and critically analyzed. An electrodynamic method is considered for extracting all components of a (T) and 2(T) tensors from quantities measured in microwave experiments. The main attention is focused on the evolution of Z(T) and sigma (T) dependences in a YBa2Cu3O7-x crystal with the oxygen content variation. Possible mechanisms of conductivity are discussed in the framework of models for normal, superconducting, and pseudogap states of HTSCs.
机译:研究表面阻抗Z(T)= R(T)+ iX(T)和复电导率sigma(T)= sigma'(T)-i sigma“(T)在ab平面中的温度依赖性的结果,审查并严格分析了沿高Tc超导体(HTSCs)的c轴方向,考虑采用电动方法从微波实验中测量的量中提取(T)和2(T)张量的所有分量。重点研究了YBa2Cu3O7-x晶体中氧含量变化对Z(T)和sigma(T)依赖性的演变,并在HTSC的正常,超导和伪能隙模型的框架内讨论了电导率的可能机制。

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