High-temperature optical spectral weight and fermi-liquid renormalization in bi-based cuprate superconductors.
Phys Rev Lett
; 105(7): 077002, 2010 Aug 13.
Article
em En
| MEDLINE
| ID: mdl-20868070
ABSTRACT
The optical conductivity σ(ω) 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 σ(ωâ0) 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, as shown by the good agreement with dynamical mean field calculations.
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Phys Rev Lett
Ano de publicação:
2010
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Article
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Itália