Thermal Fluctuations of Ferroelectric Nanodomains in a Ferroelectric-Dielectric 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>PbTiO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mi>SrTiO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
 Superlattice

Zhang, Qingteng; Đufresne, Eric M.; Chen, Pice; Park, Joonkyu; Cosgriff, Margaret P.; Yusuf, Mohamad; Dong, Yongqi; Fong, Dillon D.; Zhou, Hua; Cai, Zhonghou; Harder, Ross; Callori, Sara J.; Dawber, Matthew; Evans, Paul G.; Sandy, Alec

doi:10.1103/physrevlett.118.097601

Cited by 21 publications

(16 citation statements)

References 21 publications

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“…The jamming behavior is attributed to ultraslow ballistic motions as a result of relaxations driven by an internal stress field. A similar jamming behavior has been reported previously in ferroelectric PbTiO 3 /SrTiO 3 superlattice thin films, materials exhibiting charge density waves, and magnetic and orbital ordering [41][42][43]. On the other hand, the exponential (β = 1) and the stretched exponential (β < 1) indicate diffusive and subdiffusive relaxation usually found in glass-forming liquids and colloidal suspensions, respectively [44][45][46].…”

Section: Resultssupporting

confidence: 85%

“…[14]), and as the boundary conditions remain the same, the characteristic fluctuation timescales are also relatively constant. The fitted timescale of a/c domain fluctuations is ∼1.3 × 10 4 s, which is comparable to the timescale in other ferroelectric systems far below the Curie temperature [41]. With a further increase in temperature (from 45°C to 55°C), a decrease in fluctuation timescales is observed as the transformation to the a/c domains continues.…”

Section: Discussionsupporting

confidence: 64%

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Domain fluctuations in a ferroelectric low-strain BaTiO3 thin film

Zhong

Jangid

et al. 2020

Phys. Rev. Materials

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A ferroelectric BaTiO 3 thin film grown on a NdScO 3 substrate was studied using x-ray photon correlation spectroscopy (XPCS) to characterize thermal fluctuations near the a/b to a/c domain structure transformation present in this low-strain material, which is absent in the bulk. XPCS studies provide a direct comparison of the role of domain fluctuations in first-and second-order phase transformations. The a/b to a/c domain transformation is accompanied by a decrease in fluctuation timescales, and an increase in intensity and correlation length. Surprisingly, domain fluctuations are observed up to 25°C above the transformation, concomitant with the growth of a/c domains and coexistence of both domain types. After a small window of stability, as the Curie temperature is approached, a/c domain fluctuations are observed, albeit slower, potentially due to the structural transformation associated with the ferroelectric to paraelectric transformation. The observed time evolution and reconfiguration of domain patterns highlight the role played by phase coexistence and elastic boundary conditions in altering fluctuation timescales in ferroelectric thin films.

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Section: Resultssupporting

confidence: 85%

Section: Discussionsupporting

confidence: 64%

Domain fluctuations in a ferroelectric low-strain BaTiO3 thin film

Zhong

Jangid

et al. 2020

Phys. Rev. Materials

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“…XPCS can be Figure 8. Bragg coherent diffractive imaging and X-ray photo correlation spectroscopy imaging defects [76] and probing disorders [83]. Coherent X-rays are incident on a lithium ion battery cathode nanoparticle (green) containing an edge dislocation.…”

Section: Ion Doping Methodsmentioning

confidence: 99%

“…As demonstrated in Figure 8(b), Bragg-geometry XPCS has been employed to study the thermal fluctuations of ferroelectric nanodomains in oxide superlattices, which exhibit a continuous temporal decorrelation due to spontaneous domain fluctuations (e.g. spatial disorder) [83]. Extended XPCS measurements to probe heterogeneous domain dynamics of ionic defects (i.e.…”

Section: Ion Doping Methodsmentioning

confidence: 99%

Beyond electrostatic modification: design and discovery of functional oxide phases via ionic-electronic doping

Zhang

Zhou

et al. 2018

Advances in Physics: X

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A new research field of functional materials and device physics is rising that combines ionic transport with charge carrier modulation to realize emergent physical properties and discovery of metastable phases. The paradigm for enabling function extends far beyond carrier accumulation or depletion in band semiconductors or simply moving ions through an insulating electrolyte. Rather, by carefully selecting electronically or structurally fragile materials, one can collapse or open band gaps via extreme ionic dopant concentration, or reconfigure their entire crystal structure to create new phases. Electron-electron and electron-lattice interactions can be coupled or controlled independently in such systems via electric fields without thermal constraints by use of ionic dopants. The unifying theme across these studies is to introduce ions and electrons via electric fields through interfaces, with electrochemistry playing a dominant role. In this review, we briefly summarize this nascent field of iontronics and discuss principal results to date with examples from binary and complex oxides as well as selected 2D materials systems. We conclude the review by highlighting gaps in fundamental scientific understanding and prospects for the use of such novel devices in future electronic, photonic and energy technologies.

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“…It is now possible to fabricate ferromagnetic and ferroelectric samples by growing alternating layers of different thin films, just a few unit cells in thickness, in a periodic array (superlattice) [12][13][14]. Alternating between ferroelectric and paraelectric layers (FE/PE superlattice, see figure 1), a great deal of control over the superlattice's properties can be achieved by changing the relative thicknesses of the layers [15][16][17][18]. This has generated interest in the study of FE/PE superlattices from the theoretical [19,20] and computational [21] perspectives.…”

Section: Introductionmentioning

confidence: 99%

Electrostatics and domains in ferroelectric superlattices

Bennett¹,

Basagoiti

Artacho

2020

R. Soc. open sci.

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The electrostatics arising in ferroelectric/dielectric two-dimensional heterostructures and superlattices is revisited within a Kittel model in order to define and complete a clear paradigmatic reference for domain formation. The screening of the depolarizing field in isolated ferroelectric or polar thin films via the formation of 180° domains is well understood, where the width of the domains w grows as the square-root of the film thickness d , following Kittel’s Law for thick enough films ( w ≪ d ). For thinner films, a minimum is reached for w before diverging to a monodomain. Although this behaviour is known to be qualitatively unaltered when the dielectric environment of the film is modified, we consider the quantitative changes in that behaviour induced on the ferroelectric film by different dielectric settings: as deposited on a dielectric substrate, sandwiched between dielectrics, and in a superlattice of alternating ferroelectric/dielectric films. The model assumes infinitely thin domain walls, and therefore is not expected to be reliable for film thickness in the nanometre scale. The polarization field P(r) does vary in space, deviating from ± P S , following the depolarizing field in linear response, but the model does not include a polarization-gradient term as would appear in a Ginzburg–Landau free energy. The model is, however, worth characterizing, both as paradigmatic reference, and as applicable to not-so-thin films. The correct renormalization of parameters is obtained for the thick-film square-root behaviour in the mentioned settings, and the sub-Kittel regime is fully characterized. New results are presented alongside well-known ones for a comprehensive description. Among the former, a natural separation between strong and weak ferroelectric coupling in superlattices is found, which depends exclusively on the dielectric anisotropy of the ferroelectric layer.

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Thermal Fluctuations of Ferroelectric Nanodomains in a Ferroelectric-Dielectric PbTiO3/SrTiO3 Superlattice

Cited by 21 publications

References 21 publications

Domain fluctuations in a ferroelectric low-strain BaTiO3 thin film

Domain fluctuations in a ferroelectric low-strain BaTiO3 thin film

Beyond electrostatic modification: design and discovery of functional oxide phases via ionic-electronic doping

Electrostatics and domains in ferroelectric superlattices

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