Abstract
Polarized reflectivity spectra of orthorhombic and tetragonal YBa 2Cu 3 O 7− x crystals in the 1–3 eV range were studied. Two types of anisotropy of optical properties (reflection) in the a- b plane were observed for superconducting orthorhombic crystals. The first is attributable to the crystal symmetry and reflects the nonequivalence of the a and b axes. The other type of anisotropy appears in the twinned regions of the crystal and is governed by the twin symmetry.
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