Raman Scattering in Bi-Sr-Ca-Cu-O Single Crystals

Abstract
Dynamical spin fluctuation and lattice vibration in Bi-Sr-Ca-Cu-O single crystals with T c=80 K is investigated by Raman scattering. Very broad scattering, ranging from low energy to over 4000 cm-1, is observed together with more than ten phonon peaks. Very broad scattering is assigned to the two-magnon scattering from the overdamped spin fluctuation on the two-dimensional Cu-O layers as in the case of superconducting (La1-x Sr x )2CuO4 and YBa2Cu3O7-y .