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

Autor:	Nicoletti, D., Limaj, O., Calvani, P., Rohringer, G., Toschi, A., Sangiovanni, G., Capone, M., Held, K., Ono, S., Ando, Yoichi, Lupi, S.
Rok vydání:	2010
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Zdroj:	Physical Review Letters 105, 077002 (2010)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.105.077002
Popis:	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. Comment: 5 pages, 3 figures, Physical Review Letters in press
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1003.3345 Zobrazit plný text záznamu View this record from Arxiv