Pressure as a probe of the physics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>18</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:math>-substituted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SrTiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Venturini, E. L.; Samara, G. A.; Itoh, Makoto; Wang, R.

doi:10.1103/physrevb.69.184105

Cited by 34 publications

(67 citation statements)

References 31 publications

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“…Other specific T -dependences are displayed in Table II. For d = 3, we have g ∼ T 2 ; this relation was experimentaly observed 14,33 in ST O. Finally we note that the FSS that we have discussed suggests the " ω T " scaling form…”

Section: Finite-size Scaling In Timementioning

confidence: 86%

Quantum critical paraelectrics and the Casimir effect in time

2009

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We study the quantum paraelectric-ferroelectric transition near a quantum critical point, emphasizing the role of temperature as a "finite size effect" in time. The influence of temperature near quantum criticality may thus be likened to a temporal Casimir effect. The resulting finitesize scaling approach yields 1 T 2 behavior of the paraelectric susceptibility (χ) and the scaling form, recovering results previously found by more technical methods. We use a Gaussian theory to illustrate how these temperature-dependences emerge from a microscopic approach; we characterize the classical-quantum crossover in χ, and the resulting phase diagram is presented. We also show that coupling to an acoustic phonon at low temperatures (T ) is relevant and influences the transition line, possibly resulting in a reentrant quantum ferroelectric phase.Observable consequences of our approach for measurements on specific paraelectric materials at low temperatures are discussed.

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Section: Finite-size Scaling In Timementioning

confidence: 86%

Quantum critical paraelectrics and the Casimir effect in time

2009

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“…It is practically independent of the concentration of 18 O within the resolution of the neutron scattering experiment and the same as in STO-16 [4]. This indicates that the softening of the polar TO soft mode-though present [6]-is not the only mechanism driving the ferroelectric transition in STO-18 as assumed so far and that some other mechanism should be present, too.…”

mentioning

confidence: 73%

Order-Disorder Component in the Phase Transition Mechanism ofO18Enriched Strontium Titanate

Blinc

Zalar

Laguta³

et al. 2005

Phys. Rev. Lett.

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Ti and Sr nuclear magnetic resonance spectra of 18O enriched SrTiO3 (STO-18) provide direct evidence for Ti disorder already in the cubic phase and show that the ferroelectric transition at T(C)=24 K occurs in two steps. Below 70 K rhombohedral polar clusters are formed in the tetragonal matrix. These clusters subsequently grow in concentration, freeze out, and percolate, leading to an inhomogeneous ferroelectric state below T(C). This shows that the elusive ferroelectric transition in STO-18 is indeed connected with local symmetry lowering and implies the existence of an order-disorder component in addition to the displacive soft mode one. Rhombohedral clusters, Ti disorder, and a two-component state are found in the so-called quantum paraelectric state of STO-16 as well. The concentration of the rhombohedral clusters is, however, not high enough to allow for percolation.

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“…[5] On the shorter length scale, quasi firstorder Raman scattering by soft (TOi) and hard (TOi and TCU) polar modes gave evidence for Ca-induced FE microregions (FMRs), or polar nanodomains, whose size is determined by temperature-dependent correlation radius, r c , and the crystal exhibits the dipolar glass response of a relaxor ferroelectric. [6,8] [5] Because the occurrence of FE transitions in the quantum regime is determined by a very delicate balance between competing interactions, the application of hydrostatic pressure can be expected to strongly influence the phase behavior and the dielectric properties and provide important insight into the physics.…”

Section: Introductionmentioning

confidence: 99%

Pressure As A Probe Of The Physics Of Compositionally-Substituted Quantum Paraelectrics: SrTiO3

Venturini¹,

Samara²,

Itoh³

et al. 2003

AIP Conference Proceedings

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The influence of pressure on the dielectric properties and phase behavior was investigated for two substituted single crystals of SrTiO 3 : (a) 18 O exchanged SrTi 18 O 3 and (b) lightly doped Si^C^TiCs with x = 0.007 [SCT (0.007)]. The 18 O atoms in STO-18 reduce both the quantum fluctuations of the TiO 6 octahedra and the frequency of the soft phonon mode, leading to a ferroelectric (FE) state via a first-order transition with T c ~ 24 K at 1 bar. T c decreases very rapidly under pressure with an initial slope of ~ 20 K/kbar, reaching the quantum displacive limit (T c = 0 K) near 0.7 kbar. In the case of SCT (0.007), fluctuating polar nanodomains surround the off-center Ca dopants and grow in size as the correlation length for dipolar interactions in the SrTiO 3 host increases with decreasing temperature. Ultimately, the fluctuations slow down and the nanodomains "freeze" into a relaxor state with T max ~ 18 K; pressure reduces T max with an initial slope of ~ 35 K/kbar. Both the FE transition in STO-18 and the relaxor state of SCT (0.007) are completely suppressed below 1 kbar and a quantum paraelectric state emerges.

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Pressure as a probe of the physics of18O-substitutedSrTiO3

Cited by 34 publications

References 31 publications

Quantum critical paraelectrics and the Casimir effect in time

Quantum critical paraelectrics and the Casimir effect in time

Order-Disorder Component in the Phase Transition Mechanism ofO18Enriched Strontium Titanate

Pressure As A Probe Of The Physics Of Compositionally-Substituted Quantum Paraelectrics: SrTiO3

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