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arXiv 1003.3345cond-mat.supr-concond-mat.str-el
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Bi系铜氧化物的高温光谱权重和费米液体重整化

High-temperature optical spectral weight and Fermi liquid renormalization in Bi-based cuprates

D. Nicoletti, O. Limaj, P. Calvani, G. Rohringer, A. Toschi, G. Sangiovanni, M. Capone, K. Held, S. Ono, Yoichi Ando, S. Lupi

摘要:

在500 K温度下首次测量了两种最佳掺杂的超导铜酸盐Bi_2Sr_2-xLa_xCuO_6和Bi_2Sr_2CaCu_2O_8的光学电导率和光谱权重W(T)。在300 K以上,W(T)偏离了两种化合物通常的T2行为,即使光学电导率的零频率外推仍然大于Ioffe-Regel极限。令人惊讶的是,索末菲展开的T4项很好地描述了这种偏差,但其系数因强相关性而增强。这种重正化是由于强关联,与动力学平均场计算的良好协议所示。

英文摘要:

The optical conductivity and the spectral weight W(T) of two superconducting cuprates at optimum doping, Bi2Sr2-xLaxCuO6 and Bi2Sr2CaCu2O8, have been first measured up to 500 K. Above 300 K, W(T) deviates from the usual T2 behavior in both compounds, even though the zero-frequency extrapolation of the optical conductivity remains larger than the Ioffe-Regel limit. The deviation is surprisingly well described by the T4 term of the Sommerfeld expansion, but its coefficients are enhanced by strong correlation. This renormalization is due to strong correlation, as shown by the good agreement with dynamical mean field calculations.

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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