Neutron Diffuse Scattering from Polar Nanoregions in the Relaxor Pb(Mg1/3Nb2/3)O3

Abstract

We have studied the neutron diffuse scattering in the relaxor PMN. The diffuse scattering appears around the Burns temperature (~620K), indicating its origin from the polar nanoregions (PNR). While the relative diffuse intensities are consistent with previous reports, they are entirely different from those of the lowest-energy TO phonon. Because of that, it has been considered that this TO mode could not be the ferroelectric soft mode. Recently, a neutron scattering study has unambiguously shown that the TO mode does soften on cooling. If the diffuse scattering in PMN originates from the soft mode condensation, then the atomic displacements must satisfy the center of mass condition. But, the atomic displacements determined from diffuse scattering intensities do not fulfill this condition. To resolve this contradiction, we propose a simple model in which the total atomic displacement consists of two components: ${\delta }_{CM}$ is created by the soft mode condensation, satisfying the center of mass condition, and, ${\delta }_{shift}$ represents a uniform displacement of the PNR along their polar direction relative to the surrounding (unpolarized) cubic matrix. Within this framework, we can successfully describe the neutron diffuse scattering intensities observed in PMN.

7 pages, 7 figures (Revised: 11-16-2001)

References in corpus (1)

• Soft Mode Dynamics Above and Below the Burns Temperature in the Relaxor Pb(Mg_1/3Nb_2/3)O_3

Cited by in corpus (47)

• A Neutron Elastic Diffuse Scattering Study of PMN
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• The role of random electric fields in relaxors
• A reassessment of the Burns temperature and its relationship to the diffuse scattering, lattice dynamics, and thermal expansion in the relaxor PMN
• Neutron Diffraction Study of Field Cooling Effects on Relaxor Ferroelectrics Pb[(Zn_{1/3} Nb_{2/3})_{0.92} Ti_{0.08}] O_{3}
• Universal Static and Dynamic Properties of the Structural Transition in Pb(Zn1/3Nb2/3)O3
• Ground State of Relaxor Ferroelectric $Pb(Z{n}_{1/3}N{b}_{2/3})O_3$
• Dual structures in PZN-xPT ferroelectric relaxors
• Structural phase transition and dielectric relaxation in Pb(Zn1/3Nb2/3)O3 single crystals
• Mode-coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O3
• Neutron Scattering Study of Relaxor Ferroelectric (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3
• Cold neutron scattering study on diffuse and phonon excitations in the relaxor PbMg(1/3)Nb(2/3)O3
• A Universal Phase Diagram for PMN-xPT and PZN-xPT
• Damped Soft Phonons and Diffuse Scattering in 40PMN-60PT
• Interplay between static and dynamic polar correlations in relaxor Pb(Mg_{1/3}Nb_{2/3})O_{3}
• Coexistence and competition of local- and long-range polar orders in a ferroelectric relaxor
• Neutron and X-ray diffraction study of cubic [111] field cooled Pb(Mg1/3Nb2/3)O3
• Soft phonon columns on the edge of the Brillouin zone in the relaxor PbMg1/3Nb2/3O3
• Quasi-Elastic Scattering, Random Fields and phonon-coupling effects in PbMg1/3Nb2/3O3
• An Anomalous Phase in the Relaxor Ferroelectric Pb(Zn${}_{1/3}$Nb${}_{2/3}$)O${}_3$
• Strong Influence of the diffuse component on the lattice dynamics in Pb(Mg${}_{1/3}$Nb${}_{2/3}$)O${}_3$
• Diffuse neutron scattering in relaxor ferroelectric PbMg1/3Nb2/3O3
• The Persistence and Memory of Polar Nano-Regions in a Ferroelectric Relaxor Under an Electric Field
• Disorder and relaxation mode in the lattice dynamics of PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$ relaxor ferroelectric
• Electric Field Effects on the Diffuse Scattering in PZN-8%PT
• Competing orders in PZN-xPT and PMN-xPT relaxor ferroelectrics
• Far-infrared soft mode behavior in PST thin films
• Dielectric properties and lattice dynamics of Ca-doped K${}_{0.95}$Li${}_{0.05}$TaO${}_3$
• Evidence for anisotropic polar nanoregions in relaxor PMN: A neutron study of the elastic constants and anomalous TA phonon damping
• A two-component model of the neutron diffuse scattering in the relaxor ferroelectric PZN-4.5%PT
• Response of polar nanoregions in 68%Pb(Mg1/3Nb2/3)O3-32%PbTiO3 to a [001] electric field
• Neutron scattering study of PbMg${}_{1/3}$Ta${}_{2/3}$O${}_3$ and BaMg${}_{1/3}$Ta${}_{2/3}$O${}_3$ complex perovskites
• Cubic lead perovskite PbMoO3 with anomalous metallic behavior
• Coupled magnetic and ferroelectric excitations in PbFe_{1/2}Nb_{1/2}O_{3}
• Spontaneous decay of a soft optical phonon in the relaxor ferroelectric PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$
• Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg${}_{1/3}$Ta${}_{2/3}$O${}_3$
• Freezing of the local dynamics in the relaxor ferroelectric PZN-4.5PT
• The effect of local dipole moments on the structure and lattice dynamics of K0.98Li0.02TaO3
• 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
• Fast broadband cluster spin-glass dynamics in PbFe${}_{1/2}$Nb${}_{1/2}$O${}_3$
• Resonance Damping of the THz-frequency Transverse Acoustic Phonon in the Relaxor Ferroelectric KTa1-xNbxO3
• Magnetic skin effect in Pb(Fe${}_{1/2}$Nb${}_{1/2}$)O${}_3$
• Microscopic flexoelectricity in the canonical PMN relaxor