Effects of atomic short-range order on properties of the 
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 relaxor ferroelectric

Prosandeev, S. A.; Bellaïche, L.

doi:10.1103/physrevb.94.180102

Cited by 16 publications

(7 citation statements)

References 44 publications

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“…the volumes of various ferroelectric domains, rather than affecting the SRPO directly. This reiterates results from other work showing that the SRPO are strongly dependent on the chemical short-range order 36,37 , where the latter is obviously not sensitive to a moderate electric field. In addition, our fieldmeasurements provides a way to understand how the SRPO and long-range ferroelectric order coexist, by tuning the relative volumes of domains with different long-range polarizations.…”

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confidence: 90%

Electric field effect on short-range polar order in a relaxor ferroelectric system

Zhang

et al. 2019

Phys. Rev. B

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Short-range polar orders in the relaxor ferroelectric material PbMg 1/3 Nb 2/3 O3-28%PbTiO3 (PMN-28PT) have been studied using neutron diffuse scattering. An external electric field along [110] direction can affect the diffuse scattering in the low temperature rhombohedral/monoclinic phase. Diffuse scattering intensities associated with [110] short-range polarizations are partially suppressed, while those arising from [110] polarizations are enhanced. On the other hand, short-range polar orders along other equivalent 110 directions, i.e. [101],[101], [011], and [011] directions, are virtually unaffected by the field.Our results, combined with previous work, strongly suggest that most part of short-range polar orders in PMN-xPT relaxor systems are robust in the low temperature phase, where they couple strongly to ferroelectric polarizations of the surrounding ferroelectric domains, and would only respond to an external field indirectly through ferroelectric domain rotation. PACS numbers: 63.20.kk,75.30.Ds,75.85.+t,61.05.fg PbMg 1/3 Nb 2/3 O 3 (PMN) is a prototypical lead based relaxor system where no long-range polar order can be established without an external electric field 1-4 . Due to the existence of strong random field 5-9 , short-range polar orders (SRPO), or, sometimes referred to as "polar nano-regions" (PNR) start to appear in the system at the Burn's temperture T d ∼ 620 K and grow with cooling 10 . These SRPO are believed to contribute to many unique properties of the relaxor material 11 . When mixed with the classical ferroelectric PbTiO 3 (PT), spontaneous ferroelectric polarizations can start to develop, and the solid solutions of PMN-xPT naturally exhibit combined ferroelectric and relaxor characteristics. In the mean time, the system shows extraordinary piezoelectric properties when approaching the Morphotropic Phase Boundary (MPB). There is evidence that the SRPO are important for the high piezoelectric responses as well [12][13][14] . The relaxor properties gradually disappear when the system crosses MPB into the regime of classic ferroelecrtrics [15][16][17][18] . For those with low PT concentrations, i.e. on the left side of the MPB, the SRPO can actually persist into the low temperature longrange ferroelectric ordered phase 19,20 , and therefore offers a fascinating platform to study how long-and short-range polar orders coexist and compete 21 .Diffuse scattering measurements are very sensitive to inhomogeneities in various materials systems, and have been used extensively to probe the SRPO in relaxors [22][23][24][25][26][27][28][29][30][31][32][33] . In general we find that in lead-based relaxors such as PMN-xPT and their analogue PZN-xPT, the diffuse scattering is dominated by intensities extending along 110 directions in reciprocal space (see Fig. 1), which is sometimes denoted as the "butter-fly diffuse" [due to its shape in the (HK0) scattering plane] or "T2 diffuse" (due to its relation to T2 phonon modes in the system) 34 . In order to determine how the SRPO affect ferroelec-FIG. ...

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confidence: 90%

Electric field effect on short-range polar order in a relaxor ferroelectric system

Zhang

et al. 2019

Phys. Rev. B

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“…Advances in nanoscale applications are envisaged with epitaxial RFE films, and some of them have already been demonstrated [25,26]. Concurrently, the understanding of RFE behavior in epitaxial thin films continues to be a major challenge despite intensive theoretical efforts made in recent years [27][28][29][30][31][32][33]. In particular, understanding of the lowtemperature state is crucial for achieving desired functionalities in epitaxial RFE films.…”

Section: Introductionmentioning

confidence: 99%

Hybrid polar state in epitaxial (111) PbSc0.5Nb0.5O3 relaxor ferroelectric films

Peräntie

Savinov

Kocourek

et al. 2019

Phys. Rev. Materials

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In relaxor ferroelectrics, the interplay between the short-range-order dipolar state and long-range-order ferroelectric state leads to outstanding response functions, which enable valuable capacitor, electromechanical, pyroelectric, and electrocaloric applications. Advanced applications are envisaged with epitaxial relaxor ferroelectric films, whose fundamentals are still poorly explored. In particular, frustration of ferroelectricity, contrasting the bulk behavior, has been found and ascribed to nonpolar crystal orientation in (001) epitaxial films of archetypical lead-based relaxors. Here, a peculiar hybrid polar state, where coexisting long-range and short-range orders persist to very low temperatures, is demonstrated in epitaxial polar-oriented (111) PbSc 0.5 Nb 0.5 O 3 films. The hybrid state is evidenced by relaxorlike frustrations of ferroelectric transition and the Curie-Weiss behavior, validity of the Vogel-Fulcher relationship, a non-Rayleigh dynamic nonlinearity, and a ferroelectriclike low-temperature polarization. Local fluctuations of lattice strain arising from the relaxation of large epitaxial misfit are suggested to be responsible for the hybrid polar state. Introducing strain fluctuations by doping or nanostructuring is anticipated to boost the dynamic dielectric and piezoelectric performance of many perovskite oxide ferroelectrics.

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“…Moreover, we hope that the present discoveries that the giant EC coefficient in the vicinity of the critical point corresponds to the percolation threshold while (the still large) α max for higher temperatures is related to other specific microscopic features further lead to a better understanding of EC effects and relaxor ferroelectrics. It will also be interesting in a near future to investigate the effect of long-range and/or short-range chemical orders between Mg and Nb ions on the electrocaloric response of PMN, since properties of such system has been shown to be dependent on it [51].…”

Section: Discussionmentioning

confidence: 99%

Giant electrocaloric response in the prototypical Pb(Mg,Nb) O3 relaxor ferroelectric from atomistic simulations

et al. 2018

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An atomistic effective Hamiltonian is used to investigate electrocaloric (EC) effects of Pb(Mg 1/3 Nb 2/3 )O3 (PMN) relaxor ferroelectrics in its ergodic regime, and subject to electric fields applied along the pseudocubic [111] direction. Such Hamiltonian qualitatively reproduces (i) the electric field-versus-temperature phase diagram, including the existence of a critical point where first-order and second-order transitions meet each other; and (ii) a giant EC response near such critical point. It also reveals that such giant response around this critical point is microscopically induced by field-induced percolation of polar nanoregions. Moreover, it is also found that, for any temperature above the critical point, the EC coefficient-versus-electric field curve adopts a maximum (and thus larger electrocaloric response too), that can be well described by the general Landau-like model proposed in [Jiang et al, Phys. Rev. B 96, 014114 (2017)] and that is further correlated with specific microscopic features related to dipoles lying along different rhombohedral directions. Furthermore, for temperatures being at least 40 K higher than the critical temperature, the (electric field, temperature) line associated with this maximal EC coefficient is below both the Widom line and the line representing percolation of polar nanoregions.

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Effects of atomic short-range order on properties of the PbMg1/3Nb2/3O3 relaxor ferroelectric

Cited by 16 publications

References 44 publications

Electric field effect on short-range polar order in a relaxor ferroelectric system

Electric field effect on short-range polar order in a relaxor ferroelectric system

Hybrid polar state in epitaxial (111) PbSc0.5Nb0.5O3 relaxor ferroelectric films

Giant electrocaloric response in the prototypical Pb(Mg,Nb) O3 relaxor ferroelectric from atomistic simulations

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