Anisotropic optical properties of single-crystal GdBa2Cu3O7-delta

Zelezny, V. and Tanner, D. B. and Kamarás, Katalin (1995) Anisotropic optical properties of single-crystal GdBa2Cu3O7-delta. ZEITSCHRIFT FÜR PHYSIK B-CONDENSED MATTER, 96 (3). pp. 313-318. ISSN 0722-3277

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Abstract

The optical spectrum of reduced-T(c) GdBa2Cu3O7-delta has been measured for polarizations parallel and perpendicular to the ab plane. The sample was an oxygen-deficient single crystal with a large face containing the c axis. The polarized reflectance from this face was measured from 20-300 K in the spectral region from 30-3000 cm-1, with 300 K data to 30 000 cm-1. Kramers-Kronig analysis was used to determine the spectral dependence of the ab and the c components of the dielectric tensor. The optical properties are strongly anisotropic. The ab-plane response resembles that of other reduced-T(c) materials whereas the c axis, in contrast, shows only the presence of several phonons. There is a complete absence of charge carrier response along c above and below T(c). This observation allows us to set an upper limit to the free-carrier spectral weight for transport perpendicular to the CuO2 planes.

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