Anomalous optical absorption in overdoped cuprates near the charge-ordering instability

Details Anomalous optical absorption in overdoped cuprates near the charge-ordering instability Anomalous optical absorption in overdoped cuprates near the charge-ordering instability

2001-08-02

arxiv.org/abs/cond-mat/0108039v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.147001

We propose an interpretation for the hump observed in the optical conductivity at or below a few hundreds of cm$^{-1}$, in overdoped cuprates like the electron-doped Nd_{2-x}Ce_xCuO_{4-y} at x\gtrsim 0.15 and the hole-doped Bi_2Sr_2CuO_6 and La_{2-x}Sr_xCuO_4. This interpretation is based on the direct excitation of charge collective modes, which become nearly critical in the proximity to a charge-ordering instability. The nearly critical character of these excitations entails a peculiar temperature dependence and a pseudo-scaling form of the lineshapes, which are in agreement with the experimental data.

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