A two-component model of the neutron diffuse scattering in the relaxor ferroelectric PZN-4.5%PT

Abstract

We report measurements of the neutron diffuse scattering in a single crystal of the relaxor ferroelectric material 95.5%Pb(Zn${}_{1/3}$Nb${}_{2/3}$)O${}_3$-4.5%PbTiO${}_3$ (PZN-4.5%PT). Our results suggest that the nanometer scale structure in this compound exhibits both $<100>$ and $<110>$ polarizations, which contribute to different portions of the total diffuse scattering intensity. These contributions can be distinguished by the differing responses to an electric field applied along [001]. While diffuse scattering intensities associated with $<110>$ (T2-type) polarizations show little to no change in a [001] field, those associated with $<100>$ (T1-type) polarizations are partially suppressed by the field at temperatures below the Curie temperature \emph{T${}_C$} $\sim 475$ K. Neutron spin-echo measurements show that the diffuse scattering at (0.05,0,1) is largely dynamic at high temperature and gradually freezes on cooling, becoming mostly static at 200 K.

7 pages, 6 figures, 3 tables. submitted to Phys. Rev. B.

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Cited by in corpus (5)

• Freezing of the local dynamics in the relaxor ferroelectric PZN-4.5PT
• Fluctuating defects in the incipient relaxor K${}_{1-x}$Li${}_x$TaO${}_3$ (x=0.02)
• Electric field effect on short-range polar orders in a relaxor ferroelectric system
• Broadband critical dynamics in disordered lead-based perovskites
• Phonon coupling to dynamic short-range polar order in a relaxor ferroelectric near the morphotropic phase boundary