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首页> 外文期刊>Journal of Superconductivity >Microwave Surface Impedance and Complex Conductivity of High-T{sub}c Single Crystals: Current State and Unsolved Problems
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Microwave Surface Impedance and Complex Conductivity of High-T{sub}c Single Crystals: Current State and Unsolved Problems

机译：高T {sub} c单晶的微波表面阻抗和复电导率：当前状态和未解决的问题

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摘要

Common and distinctive features of the temperature dependences of microwave surface impedance Z(T) = R(T) + iX(T) and conductivity σ(T) in the ab-plane and along the c-axis of high-T{sub}c single crystals (HTSC) are discussed. The main attention is focused on an evolution of these dependences in YBaCuO crystal with the oxygen deficiency. Comparison of YBaCuO with other HTSC crystals reveals a number of peculiarities, namely, the linear dependence R{sub}(ab)(T) ∝ T up to T{sub}c/2 in HTSC single crystals with tetragonal lattice and up to T{sub}c/3 in YBaCuO where R{sub}(ab)(T) shows also a broad peak at T ～ T{sub}c/2; breakdown of normal skin effect in some HTSC crystals; dramatic effect of pseudogap on the superfluid density in the heavily underdoped YBCO; several orders of magnitude higher residual surface resistance in HTSC when compared to conventional superconductors; etc. Possible explanations are discussed in the context of the specific features of HTSC structure and in the framework of recent models of quasiparticles' c-transport and pseudogap state in HTSC.
机译：微波表面阻抗Z（T）= R（T）+ iX（T）和电导率σ（T）在a平面和沿高T {sub}的c轴的温度依赖性的共同和独特特征讨论了单晶（HTSC）。主要的注意力集中在缺氧的YBaCuO晶体中这些依赖性的演变上。 YBaCuO与其他HTSC晶体的比较显示出许多特性，即在具有四方晶格和T的HTSC单晶中，线性依赖性R {sub}（ab）（T）∝ T直至T {sub} c / 2 YBaCuO中的{sub} c / 3，其中R {sub}（ab）（T）在T〜T {sub} c / 2处也显示出一个宽峰。在某些HTSC晶体中正常皮肤效应的分解;伪间隙对重掺杂YBCO中超流体密度的显着影响;与传统的超导体相比，HTSC中的残余表面电阻高出几个数量级;在HTSC结构的特定特征的背景下以及在HTSC中的准粒子c传输和伪能隙状态的最新模型的框架中讨论了可能的解释。

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