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Anisotropic optical properties of single-crystal GdBa2Cu3O7−δ

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Zeitschrift für Physik B Condensed Matter

Abstract

The optical spectrum of reduced-T c GdBa2Cu3O7−δ has been measured for polarizations parallel and perpendicular to theab plane. The sample was an oxygen-deficient single crystal with a large face containing thec 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 30000 cm−1. Kramers-Kronig analysis was used to determine the spectral dependence of theab and thec components of the dielectric tensor. The optical properties are strongly anisotropic. Theab-plane response resembles that of other reduced-T c materials whereas thec axis, in contrast, shows only the presence of several phonons. There is a complete absence of charge carrier response alongc aboveand belowT 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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Permanent address: Institute of Physics, CSAV, Prague, Czechoslovakia

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Železny, V., Tanner, D.B., Kamarás, K. et al. Anisotropic optical properties of single-crystal GdBa2Cu3O7−δ . Z. Physik B - Condensed Matter 96, 313–318 (1995). https://doi.org/10.1007/BF01313052

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