Universal Static and Dynamic Properties of the Structural Transition in Pb(Zn1/3Nb2/3)O3

Abstract

The relaxors Pb(Zn${}_{1/3}$Nb${}_{2/3}$)O${}_3$ (PZN) and Pb(Mg${}_{1/3}$Nb${}_{2/3}$)O${}_3$ (PMN) have very similar properties based on the dielectric response around the critical temperature $T_c$ (defined by the structural transition under the application of an electric field). It has been widely believed that these materials are quite different below $T_c$ with the unit cell of PMN remaining cubic while in PZN the low temperature unit cell is rhombohedral in shape. However, this has been clarified by recent high-energy x-ray studies which have shown that PZN is rhombohedral only in the skin while the shape of the unit cell in the bulk is nearly cubic. In this study we have performed both neutron elastic and inelastic scattering to show that the temperature dependence of both the diffuse and phonon scattering in PZN and PMN is very similar. Both compounds show a nearly identical recovery of the soft optic mode and a broadening of the acoustic mode below $T_c$. The diffuse scattering in PZN is suggestive of an onset at the high temperature Burns temperature similar to that in PMN. In contrast to PMN, we observe a broadening of the Bragg peaks in both the longitudinal and transverse directions below $T_c$. We reconcile this additional broadening, not observed in PMN, in terms of structural inhomogeneity in PZN. Based on the strong similarities between PMN and PZN, we suggest that both materials belong to the same universality class and discuss the relaxor transition in terms of the three-dimensional Heisenberg model with cubic anisotropy in a random field.

11 pages, 10 figures. Updated version after helpful referee comments

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• Dynamical effects of the nanometer-sized polarized domains in Pb(Zn1/3Nb2/3)O3
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• Anomalous Phase Transition in Strained SrTiO${}_3$ Thin Films
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Cited by in corpus (36)

• 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
• Bias field effect on the temperature anomalies of dielectric permittivity in PbMg1/3Nb2/3O3- PbTiO3 single crystals
• Dual structures in PZN-xPT ferroelectric relaxors
• Structural phase transition and dielectric relaxation in Pb(Zn1/3Nb2/3)O3 single crystals
• 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${}_3$
• Direct observation of the near-surface layer in Pb(Mg${}_{1/3}$Nb${}_{2/3}$)O${}_3$ using neutron diffraction
• An Inelastic X-Ray investigation of the Ferroelectric Transition in SnTe
• The Persistence and Memory of Polar Nano-Regions in a Ferroelectric Relaxor Under an Electric Field
• Competing orders in PZN-xPT and PMN-xPT relaxor ferroelectrics
• Dielectric properties and lattice dynamics of Ca-doped K${}_{0.95}$Li${}_{0.05}$TaO${}_3$
• Dynamic origin of the morphotropic phase boundary - Soft modes and phase instability in 0.68Pb(Mg1/3Nb2/3O3)-0.32PbTiO3
• 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
• Neutron scattering study of PbMg${}_{1/3}$Ta${}_{2/3}$O${}_3$ and BaMg${}_{1/3}$Ta${}_{2/3}$O${}_3$ complex perovskites
• The Structural Phase Transition of the Relaxor Ferroelectric 68%PbMg1/3Nb2/3O3-32%PbTiO3
• Evolution of the neutron quasi-elastic scattering through the ferroelectric phase transition in 93%PbZn${}_{1/3}$Nb${}_{2/3}$O${}_3$ - 7% PbTiO${}_3$
• Metastable antiphase boundary ordering in CaFe${}_2$O${}_4$
• 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${}_3$
• Fluctuating defects in the incipient relaxor K${}_{1-x}$Li${}_x$TaO${}_3$ (x=0.02)
• The effect of local dipole moments on the structure and lattice dynamics of K0.98Li0.02TaO3
• 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${}_3$
• Anisotropic Band-Split Magnetism in Magnetostrictive CoFe${}_2$O${}_4$
• Magnetic skin effect in Pb(Fe${}_{1/2}$Nb${}_{1/2}$)O${}_3$
• Dynamics and Structure of PMN and PZN
• Field-Induced Ferroelectric Phase Transition Dynamics in PMN-PT compositions near the Morphotropic Phase Boundary