Optical properties of doped antiferromagnets.

Fleck M., Lichtenstein A.I., Olés A.M., Hedin L.

We investigate the consequences of an incommensurate magnetic order in doped La2-xSrxCuO4 using dynamical mean-field theory for the effective single-band model. The high-energy optical transitions are due to high-energy excitations across a large Mott-Hubbard "gap," while low-energy excitations involve a pseudogap induced by the local spin order. The latter lead to a strong drop in the scattering rate at low omega , in qualitative agreement with the experimental data.

Journal of Superconductivity, 12 147-9, 1999.

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