Title

Raman Spectroscopy of Single Crystals of High- Tc, Cuprates

Document Type

Article

Publication Date

1-1-1989

Abstract

We present normal mode assignments for the Raman spectra of 1-2-3-type materials on the basis of polarized Raman studies of single crystals of Ba2YCu3O7, Ba2YCu3O6, Sr2YCu2.4A10.607, and Ba2_xLaj+xCu3O7+δ. In Ba2YCu3O7 we observe five intrinsic modes at 500 [0(1) axial stretch], 435 [in-phase 0(2), 0(3) bend], 335 [out-of-phase 0(2), 0(3) bend], 140 [Cu(2) axial stretch mode], and 118 cm− 1(Ba axial mode). Defect-induced modes are found at 600 and 220 − 1. A mode at 640 − 1, which is seen only in ceramics, is shown to be due to a BaCuO2 impurity phase. Furthermore, we discuss the Raman spectra of Bi2Sr2Can − 1CunO4+2n, and the high-frequency (ω > 1000 − 1) scattering in Ba2YCu3O6 and Ba2YCu3O7.

DOI

10.1364/JOSAB.6.000448

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