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

Abstract

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.

5 pages, 3 figures, Physical Review Letters in press

References in corpus (15)

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• Saturation of electrical resistivity
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• Optical conductivity and the correlation strength of high temperature copper-oxide superconductors
• In-Plane Spectral Weight Shift of Charge Carriers in $YB{a}_{2}C{u}_3{O}_{6.9}$
• Evolution of the resistivity anisotropy in Bi_{2}Sr_{2-x}La_{x}CuO_{6+δ} single crystals for a wide range of hole doping
• Non-Universal Power Law of the "Hall Scattering Rate" in a Single-Layer Cuprate Bi_{2}Sr_{2-x}La_{x}CuO_{6}
• Doping evolution of the electronic structure in the single-layer cuprates Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_{6+\delta }$: Comparison with other single-layer cuprates
• Doping Dependence of the Redistribution of Optical Spectral Weight in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Temperature dependence of the optical spectral weight in the cuprates: Role of electron correlations
• C-axis lattice dynamics in Bi-based cuprate superconductors
• Frequency-dependent Thermal Response of the Charge System and Restricted Sum Rules in La(2-x)Sr(x)CuO(4)
• Optical Integral in the Cuprates and the Question of Sum Rule Violation
• Effect of orbital currents on the restricted optical sum rule
• Optical sum rule anomalies in the cuprates: interplay between strong correlation and electronic bandstructures

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