Disorder and relaxation mode in the lattice dynamics of PbMg1/3Nb2/3O3 relaxor ferroelectric
S. N. Gvasaliya, S. G. Lushnikov, B. Roessli
Abstract
The low-energy part of vibration spectrum in PbMg1/3Nb2/3O3 relaxor ferroelectric was studied by inelastic neutron scattering. We observed the coexistence of a resolution-limited central peak with strong quasielastic scattering. The line-width of the quasielastic component follows a Γ0+Dq2 dependence. We find that Γ0 is temperature-dependent. The relaxation time follows the Arrhenius law well. The presence of a relaxation mode associated with quasi-elastic scattering in PMN indicates that order-disorder behaviour plays an important rôle in the dynamics of diffuse phase transitions.
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