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Coherent-to-incoherent crossover in the optical conductivity of La2-xSrxCuO4: Charge dynamics of a bad metal

The in-plane charge dynamics of lightly doped La 1 . 9 2 Sr 0 . 0 8 CuO 4 (T c =24 K) is examined and discussed. The in-plane resistivity exhibits a metallic character up to 1000 K without saturation at the Mott criterion, which is a typical behavior of a bad metal. The in-plane optical conductivity exhibits a Drude-like peak below a certain temperature, above which it is characterized by a finite-energy peak. The relationship between the shift of the Drude peak and Mott criterion for dc conductivity and the universality of the observation with respect to other had metals are discussed.