Quasi-elastic and inelastic neutron scattering in the high temperature phase of the cooperative Jahn-Teller system CsCuCl3

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Abstract
Quasi-elastic and inelastic neutron measurements have been performed to study the high-temperature phase of the cooperative Jahn-Teller system CsCuCl3. A strong coupling between phonons and dynamic reorientation processes of the distorted CuCl6 octahedra dipole-dipole interactions using the concept of pseudo-spins for describing the orientational disorder of the Jahn-Teller distorted octahedra, it is possible to interpret the characteristic features of the quasi-elastic and inelastic scattering in a unified picture. The relaxation rate of the reorientation processes was determined as 2*1010 s-1 and it is shown that the warping energy can be derived from a systematic measurement of the relaxation rate as a function of temperature.