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arXiv 1206.4474cond-mat.str-el
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铜氧化物的光电导和直流电导:t-J模型中的自旋涨落散射

Optical and dc conductivities of cuprates: Spin-fluctuation scattering in the t-J model

A. A. Vladimirov, D. Ihle, N. M. Plakida

摘要:

在t-J模型中发展了电导率的微观理论$σ(ω)$。利用Hubbard算子的松弛函数的记忆函数技术,得到了$σ(ω)$的精确表示,并导出了广义Drude定律.在模式耦合近似下,计算了由反铁磁自旋涨落辅助的电荷激发衰变为粒子-空穴对的弛豫速率。使用先前计算的自旋激发的光谱函数的结果,弛豫速率和光学和直流电导率计算在一个广泛的区域的掺杂和温度。铜氧化物的理论与实验数据的合理一致证明了自旋涨落散射在电荷动力学中的重要作用。

英文摘要:

A microscopic theory of the electrical conductivity $σ(ω)$ within the t-J model is developed. An exact representation for $σ(ω)$ is obtained using the memory-function technique for the relaxation function in terms of the Hubbard operators, and the generalized Drude law is derived. The relaxation rate due to the decay of charge excitations into particle-hole pairs assisted by antiferromagnetic spin fluctuations is calculated in the mode-coupling approximation. Using results for the spectral function of spin excitations calculated previously, the relaxation rate and the optical and dc conductivities are calculated in a broad region of doping and temperatures. The reasonable agreement of the theory with experimental data for cuprates proves the important role of spin-fluctuation scattering in the charge dynamics.

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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