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A.V.Puckov, P. Fournier, D.N. Basov, T. Timusk, A. Kapitulnik, N.N.Kolesnikov.
Evolution of the pseudogap state of high-T_c superconductors with doping.

  Abstract:
We report on a study of the infrared properties of Bi₂Sr₂CaCu₂O_8+d, Bi_1.66Pb_0.34Sr₂CaCu₂O_8+d, and Tl₂Ba₂CuO_6+d  crystals at doping levels from underdoped to strongly overdoped. We calculate the frequency-depended scattering rate 1/t(w,T) and study its doping dependence. While we observe a normal-state gaplike depression in 1/t(w,T) in the underdoped regime, it is not observed in the overdoped regime. While the high-frequency 1/t(w,T) is temperature independent in the underdoped regime, it scales with temperature in the overdoped regime.