Doping dependence of the redistribution of optical spectral weight in Bi_{2}Sr_{2}CaCu_{2}O

Article Article scientifique Article Doping dependence of the redistribution of optical spectral weight in Bi_{2}Sr_{2}CaCu_{2}O_{8+Î´} eng 2006 author Carbone Fabrizio 582323 author Kuzmenko Alexey 0000-0001-9574-6435 135384 author Molegraaf Hajo 585989 author Van Heumen Erik 135635 author Lukovac Vladimir 94550 author Marsiglio Frank 636643 author Van Der Marel Dirk 0000-0001-5266-9847 135104 author Haule K. author Kotliar G. author Berger H. author Courjault S. author Kes P. H. author Li M. 064510 10.1103/PhysRevB.74.064510 1098-0121 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. Dewey 500.2 Swiss National Science Foundation NCCR MaNEP CH 33 Département de physique de la matière quantique 131 false 1364 Groupe Kuzmenko 785 Groupe Van der Marel Physical review. B, Condensed matter and materials physics 74 6 f07e3ec1-1890-4867-84e5-6e09c86e6a02 Article (Published version) Public doping.pdf 738706 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Doping dependence of the redistribution of optical spectral weight in Bi_{2}Sr_{2}CaCu_{2}O_{8+Î´}	Physical review. B, Condensed matter and materials physics			2006	691	314

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Lukovac, Vladimir