Optical spectroscopy of (La,Ca)14Cu24O41 spin ladders: comparison of experiment and theory
Abstract
Transmission and reflectivity of Lax Ca14-x Cu24 O41 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 sigma1 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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