Optical spectroscopy of (La,Ca)14Cu24O41 spin ladders: comparison of experiment and theory

Details Optical spectroscopy of (La,Ca)14Cu24O41 spin ladders: comparison of experiment and theory Optical spectroscopy of (La,Ca)14Cu24O41 spin ladders: comparison of experiment and theory

2001-08-27

arxiv.org/abs/cond-mat/0108437v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, submitted to SCES 2001

Scientific paper

10.1016/S0921-4526(01)01199-1

Transmission and reflectivity of La_x Ca_14-x Cu_24 O_41 two-leg spin-1/2 ladders were measured in the mid-infrared regime between 500 and 12000 1/cm. This allows us to determine the optical conductivity sigma_1 directly and with high sensitivity. Here we show data for x=4 and 5 with the electrical field polarized parallel to the rungs (E||a) and to the legs (E||c). Three characteristic peaks are identified as magnetic excitations by comparison with two different theoretical calculations.

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