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arXiv 0904.0093cond-mat.supr-concond-mat.str-el
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动能驱动的铜氧化物超导体的电磁响应:线性响应方法

Electromagnetic response in kinetic energy driven cuprate superconductors: Linear response approach

Mateusz Krzyzosiak, Zheyu Huang, Shiping Feng, Ryszard Gonczarek

摘要:

在动能驱动的超导框架下,用线性响应方法研究了铜氧化物超导体的电磁响应。的响应函数的内核进行评估,并用于计算局部磁场剖面,磁场穿透深度,和超流密度,基于纯横向矢量位的镜面反射模型。结果表明,低温磁场分布遵循指数衰减在表面上,而磁场穿透深度与温度呈线性关系,除了强烈偏离的线性特性在极低的温度。在欠掺杂区,超流密度随掺杂浓度的减小而线性减小。讨论了规范不变性问题,提出并讨论了一种不违反局域电荷守恒的缀饰电流顶点近似。

英文摘要:

Within the framework of the kinetic energy driven superconductivity, the electromagnetic response in cuprate superconductors is studied in the linear response approach. The kernel of the response function is evaluated and employed to calculate the local magnetic field profile, the magnetic field penetration depth, and the superfluid density, based on the specular reflection model for a purely transverse vector potential. It is shown that the low temperature magnetic field profile follows an exponential decay at the surface, while the magnetic field penetration depth depends linearly on temperature, except for the strong deviation from the linear characteristics at extremely low temperatures. The superfluid density is found to decrease linearly with decreasing doping concentration in the underdoped regime. The problem of gauge invariance is addressed and an approximation for the dressed current vertex, which does not violate local charge conservation is proposed and discussed.

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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