Abstract

We report on variations of the diffuse reflectance of the YBa₂Cu₃O_7−δ and Bi_2.1(Ca_xSr_1−x)_n+1Cu_nO_2n+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 YBa₂Cu₃O_7−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

Infrared studies of single-crystal La₂₋xSrxCuO₄₋δ and YBa₂Cu₃O₇₋δ

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