Abstract

Phonon spectra have been studied with the use of Raman-scattering techniques in orthorhombic and tetragonal YBa₂Cu₃O_7-δ (δ ≲ 0.8) single crystals with ¹⁶O and ¹⁸O isotopes for different light polarizations. The isotopic frequency shifts for O phonon modes corresponding to the substitution of ¹⁸O for ¹⁶O have been determined. All the O phonon modes as well as the A_g modes of Ba and Cu2 have been identified by using factor-group analysis. Relative intensities and polarizations of phonon lines have been analyzed qualitatively. We argue that the bridges connecting Cu2–O2–O3 planes to the Cu1–O1 chains produce preferential polarization of the A_g lines along the c axis.

© 1989 Optical Society of America

Raman-scattering studies of coupled modes and superconducting gap excitations in single-crystal YBa₂Cu₃O_7-δ

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