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Doping dependence of the redistribution of optical spectral weight in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}

Publication date2006

We present the ab-plane optical conductivity of four single crystals of Bi2Sr2CaCu2O8+δ(Bi2212) with different carrier doping levels from the strongly underdoped to the strongly overdoped range with Tc=66, 88, 77, and 67K, respectively. We focus on the redistribution of the low frequency optical spectral weight (SW) in the superconducting and normal states. The temperature dependence of the low-frequency spectral weight in the normal state is significantly stronger in the overdoped regime. In agreement with other studies, the superconducting order is marked by an increase of the low frequency SW for low doping, while the SW decreases for the highly overdoped sample. The effect crosses through zero at a doping concentration δ=0.19 which is slightly to the right of the maximum of the superconducting dome. This sign change is not reproduced by the BCS model calculations, assuming the electron-momentum dispersion known from ARPES data. Recent cluster dynamical mean field theory calculations based on the Hubbard and t−J models, agree in several relevant respects with the experimental data.

  • Swiss National Science Foundation - NCCR MaNEP
Citation (ISO format)
CARBONE, Fabrizio et al. Doping dependence of the redistribution of optical spectral weight in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}. In: Physical review. B, Condensed matter and materials physics, 2006, vol. 74, n° 6, p. 064510. doi: 10.1103/PhysRevB.74.064510
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Article (Published version)
ISSN of the journal1098-0121

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