Anisotropic optical properties of single-crystal GdBa2Cu3O7-δ

V. Železny, D. B. Tanner, K. Kamarás, L. P. Kozeeva, A. A. Pavlyuk

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Abstract

The optical spectrum of reduced-Tc GdBa2Cu3O7-δ 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 30000 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-Tc 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 Tc. This observation allows us to set an upper limit to the free-carrier spectral weight for transport perpendicular to the CuO2 planes.

Original languageEnglish
Pages (from-to)313-318
Number of pages6
JournalZeitschrift für Physik B Condensed Matter
Volume96
Issue number3
DOIs
Publication statusPublished - Sep 1 1995

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Keywords

  • 74.30.Gn
  • 74.70.Vy
  • 78.30.Er
  • 78.65.Ez

ASJC Scopus subject areas

  • Condensed Matter Physics

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