I will overview recent infrared studies of high quality La2-xSrxCuO4 single
crystals starting from ultra-low dopings and continuing in the
superconducting region of the phase diagram. Spectroscopic measurements
uncovered metallic conductivity at doping levels as small as 1%. The optical
conductivity revealed significant anisotropy in the regime of the so called
diagonal spin stripes (x<0.05). These experiments indicate that the
formation of spin-ordered textures in La2-xSrxCuO4 series has a profound
effect on the dynamics of charge carriers.
This work is a collaboration with W.J. Padilla, M.Dumm (UCSD) and Y.Ando
(CRIEPI)
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