Abstract
The soft transverse acoustic mode of TeO 2 has been investigated in detail by the microscopic Brillouin scattering in the backward geometry as a function of pressure. Both of quasi-transverse mode (T′) and quasi-longitudinal mode (L′) have been measured from 1 atm to 1.6 GPa (transition pressure P c = 0.9 GPa) using Diamond Anvil Cell for phonons with various propagation directions at different angles of 7.6°, 4° and 2.3°, respectively, from [110]-direction. The T′-mode for 2.3° decreased till the lowest value ∼1.37 GHz at P c. The L′-mode showed no dramatic change. We will explain these results according to a Landau theory of the ferroelastic transition under pressure.
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