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  • Title: Anomalous optical absorption in the normal state of overdoped cuprates near the charge-ordering instability.
    Author: Caprara S, Di Castro C, Fratini S, Grilli M.
    Journal: Phys Rev Lett; 2002 Apr 08; 88(14):147001. PubMed ID: 11955168.
    Abstract:
    We argue that the hump observed in the optical conductivity at or below a few hundreds of cm(-1), in overdoped cuprates such as the electron-doped Nd(2-x)Ce(x)CuO(4-y) at x > or approximately equal to 0.15 and the hole-doped Bi2Sr2CuO6 and La2-xSrxCuO4, cannot be accounted for within a single-fluid description. We propose instead an interpretation based on the direct excitation of charge collective modes, which become nearly critical in the proximity to a charge-ordering instability. Their critical character entails a peculiar temperature dependence and a pseudoscaling form of the optical spectra, which agree with the experimental data.
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