Abstract
Abstract For intermediate concentrations x, the mixed molecular crystals (KI)1-x(NH4I)x exhibit an orientational glass state at low temperatures characterized by disordered frozen in orientation of the NH4 + tetrahedra. Using ultrasonic experiments the velocity of transverse and longitudinal waves propagating along a [100] crystallographic axis have been measured in x = 0.16 and x = 0.46 crystals, respectively. An anomalous softening of the shear elastic constant is evidenced below T = 100 K, in agreement with a recent Brillouin scattering. These results are interpreted in terms of rotation-translation coupling of T2g-symmetry.
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