Abstract
Low frequency phonons and diffuse scattering have been investigated in a single crystal of (Na0.5Bi0.5)1−x Ba x TiO3 solid solution with composition (x = 4%) close to the morphotropic phase boundary by means of inelastic neutron scattering. Constant-energy scans for momentum transfer Q = (2, 2, q) reveal a typical waterfall-type dispersion at room temperature. The anomalous steep dispersion occurs at q wf ≈ 0.15 r.l.u., similar to lead-based relaxors. Since these measurements are done well below the temperature interval of the relaxor-like dielectric dispersion, our findings support a generic, anharmonic phonon-coupling nature of the phenomenon.
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