Disorder and relaxation mode in the lattice dynamics of PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$ relaxor ferroelectric

S. N. Gvasaliya, S. G. Lushnikov, B. Roessli

The low-energy part of vibration spectrum in PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$ relaxor ferroelectric was studied by inelastic neutron scattering. We observed the coexistence of a resolut…