Raman scattering from single crystals of the 84K superconductor Bi sub (2.2) Ca sub (0.8) Sr sub 2 Cu sub 2 O sub (8+delta).

We report the Raman spectrum of single crystals of Bi sub (2.2) Ca sub (0.8) Sr sub 2 Cu sub 2 O sub (8+delta). The most prominent features are at 120, 295, 462, and 625 cm sup (-1). The 462 cm sup (-1) mode is tentatively assigned to axial O(3) symmetric stretching. The 625 cm sup (-1) mode is assigned to planar Cu-O(1) bond stretching. The 120 cm sup (-1) mode shows a strong a-b anisotropy. The effect of the b-axis superstructure upon the Raman spectrum is emphasized.