RAMAN-SCATTERING OF CUGEO3

Polarization and temperature dependence of Raman scattering spectra of CuGeO3 has been measured from room temperature to 5 K. The observed p honons at room temperature are well assigned by the group theoretical estimation for Pbmm(D-2h(5)). The qualitative change for all possible Raman scattering spectra has not been found from room temperature to 1 4 K. The energy of the five inter-chain phonons increases with decreas ing temperature. Below spin-Peierls transition temperature T-sp( 14 K) , five peaks at 27, 107, 230, 370, and 820 cm(-1) have been observed f or the (c, c) geometry while the peaks at 370 and 820 cm(-1) appear fo r (b, c).