Raman Scattering Study of Phonon and Magnetic Excitations along the Magnetic Chain in CuGeO_3

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Detailed temperature dependence of (c, c) Raman scattering spectra has been measured forCuGeO3 in the vicinity of spin-Peierls transition temperature ('Z'..). Below T.., six peaks at 30,-1105, 227, 370, 416, and 817 cm have been observed. We newly observed a peak at 416 cm '.The energy of the 30 cm ' peak decreases continuously with increasing temperature and becomeszero above T.,. The peak at 30 cm ' is assigned as the soft mode in the spin-Peierls phase fromthe agreernent with the temperature dependence of the super-lattice reflection intensity. Thepeak at 227 cm ' is assigned as a two-magnon along the c-axis (Cu chain direction), The peaksat 370, 416, and 817 cm ' are assigned as the phonons, which appear by the symmetry change.The new peaks of (c, c) are not sensitive to the magnetic field along the a-axis below 9 T at 4.7K,
社団法人日本物理学会の論文
1996-12-15