Abstract
Abstract In the incommensurate phase below about 220°C of Sr2Nb2O7, the soft mode, of which frequency decreases toward 215°C has been found by the Raman scattering measurements in the b(cc) b scattering geometry. The level repulsion and the intensity transfer between the soft mode and another low frequency mode are clearly observed. The uncoupled soft mode frequency ωs has been found to be expressed as ωs =A(Ttr−T)β, where β= 0.38 ± 0.02. Pressure dependence of the soft mode has also been measured up to 24kbar. No remarkable pressure dependence has been observed.
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