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The phonon dynamics in NaTiSi 2 O 6 is studied using the Raman scattering technique. The observed phonon anomalies around T=210K combined with theoretical considerations show that the high-temperature dynamical Jahn-Teller phase of NaTiSi 2 O 6 exhibits a spontaneous breaking of translational symmetry into an orbital dimerized state. We describe this phase instability...
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