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Diffuse reflectance and its relationship to oxygen content in YBa2Cu3O7−δ and Bi2.1(CaxSr1−x)n+1CunO2n+4+δ(n= 1, 2)

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Abstract

We report on variations of the diffuse reflectance of the YBa2Cu3O7−δ and Bi2.1(CaxSr1−x)n+1CunO2n+4+δ (n = 1, 2) superconducting ceramics with oxygen content 0 < δ < 0.8. We model the diffuse refectance of the ceramics and near-infrared edge may be approximated by a single-carrier free-electron Drude model. For bismuth-based compounds, the infrared Drude edge and structures at ~2.0 and ≃3.8 eV show little variation with δ. For YBa2Cu3O7−δ, the Drude edge and the interband features vary strongly with δ. The interbrand peaks at 1.7 and 4.1 eV are both attributed to transitions involving the oxygen-loading copper planes.

© 1989 Optical Society of America

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