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Polarized reflectivity studies of single-crystal La2CuO4

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Abstract

Room-temperature polarized reflectivity measurements are reported for single-crystal La2CuO4 for the (Eĉ) and (E || ĉ) polarizations, where ĉ denotes the tetragonal axis. A Kramers–Krönig analysis is performed to obtain the frequency-dependent dielectric functions. Frequencies for the seven zone-center IR-active phonons are obtained and the longitudinal-optic–transverse-optic splittings are used to evaluate the dynamic charge on the oxygen atoms. The reflectivity spectrum for the (Eĉ) polarization is decidedly metallic and is fitted accordingly with an overdamped Drude model and a plasma frequency of 95 meV. In the high-frequency region of the spectrum, selection rules are observed for allowed and forbidden electronic transitions. The importance of this study to the interpretation of optical measurements on high-Tc, polycrystalline pellets of La2CuO4 and related materials is also discussed.

© 1989 Optical Society of America

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