Some Optical Properties of Strontium Titanate Crystal

Levin, S. B.; Field, N. J.; Plock, F. M.; Merker, Lukas

doi:10.1364/josa.45.000737

Cited by 42 publications

(10 citation statements)

References 3 publications

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“…d Mitsui & Westphal (1961) and Viana et al (1994). e Levin et al (1955) measured n at 700 nm and we use the relation 3 r = n 2 , where n is refractive index.…”

Section: Band Gap Engineering: the Case Of Sn 2 Tiomentioning

confidence: 99%

Advances in computational studies of energy materials

Catlow

Guo

Miskufova

et al. 2010

Phil. Trans. R. Soc. A.

128

145

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We review recent developments and applications of computational modelling techniques in the field of materials for energy technologies including hydrogen production and storage, energy storage and conversion, and light absorption and emission. In addition, we present new work on an Sn 2 TiO 4 photocatalyst containing an Sn(II) lone pair, new interatomic potential models for SrTiO 3 and GaN, an exploration of defects in the kesterite/stannite-structured solar cell absorber Cu 2 ZnSnS 4 , and report details of the incorporation of hydrogen into Ag 2 O and Cu 2 O. Special attention is paid to the modelling of nanostructured systems, including ceria (CeO 2 , mixed Ce x O y and Ce 2 O 3 ) and group 13 sesquioxides. We consider applications based on both interatomic potential and electronic structure methodologies; and we illustrate the increasingly quantitative and predictive nature of modelling in this field.

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“…d Mitsui & Westphal (1961) and Viana et al (1994). e Levin et al (1955) measured n at 700 nm and we use the relation 3 r = n 2 , where n is refractive index.…”

Section: Band Gap Engineering: the Case Of Sn 2 Tiomentioning

confidence: 99%

Advances in computational studies of energy materials

Catlow

Guo

Miskufova

et al. 2010

Phil. Trans. R. Soc. A.

128

145

View full text Add to dashboard Cite

show abstract

“…However, we did not examine the possibility of reduction, [17] which might give lower solution energies for some trivalent oxides. As expected, the tetravalent cations substitute on titanium sites and again the solution energy of MO increases with the mismatch between the ionic radii of substituent and host lattice cation (Fig.…”

Section: Fig 5 Plot Of ;mentioning

confidence: 99%

Point Defect Energies for Strontium Titanate: A Pair-Potentials Study

Crawford

Jacobs

1999

Journal of Solid State Chemistry

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“…The linear pressure dependence with a value of d ∞ dp 300 K = −1.43 × 10 −4 kbar −1 found by Giardini [28] for optical frequencies at room temperature was used to model the changes in ∞ . An exact numerical value for ∞ is hard to define, as n exhibits frequency dependence out to the highest frequencies measured [29,30], but can be estimated as between 2.7 -3.0 under ambient conditions. The numerical value for ∞ (p = 0) was therefore set to 2.87 by fitting the extracted phonon frequencies at ambient pressure to the experimental values found by Yamada et al [12] from inelastic neutron scattering.…”

Section: B Resultsmentioning

confidence: 99%

Pressure dependence of ferroelectric quantum critical fluctuations

et al. 2019

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The effect of ferroelectric fluctuations on the temperature dependent dielectric constant of SrTiO3 has been long studied. Those fluctuations have been shown in recent years to be quantum critical and SrTiO3 demonstrated to form the archetypal quantum critical paraelectric. The effect of those same fluctuations on the pressure and temperature dependence of the ferroelectric soft phonon mode as the system is tuned away from criticality are reported for the first time in this paper. We show that the mean field approximation is confirmed experimentally. Furthermore, using a self-consistent model of the quantum critical excitations including coupling to the volume strain and without adjustable parameters, we determine logarithmic corrections that would be observable only very close to the quantum critical point. Thus, the mean-field character of the pressure dependence is much more robust to the fluctuations than is the temperature dependence. We predict stronger corrections for lower dimensionalities however. The same calculation confirms that the Lydanne-Sachs-Teller relation is valid over the whole pressure and temperature range considered. Therefore, the measured dielectric constant can be used to extract the frequency of the soft mode down to 1.5 K and up to 20 kbar of applied pressure. The soft mode is observed to stiffen further, raising the lowtemperature energy gap and returning towards the expected shallow temperature dependence of an optical mode. This behavior is consistent with the existence of a ferroelectric quantum critical point on the pressure-temperature phase diagram of SrTiO3, which applied pressure tunes the system away from. We additionally compare the soft mode frequencies in ambient KTaO3 and show they correspond to SrTiO3 at around 2 kbar. This work represents the first experimental measurement of the stiffening of a soft phonon mode as a system is tuned away from criticality, a potentially universal phenomenon across a variety of phase transitions and systems in condensed matter physics.

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Some Optical Properties of Strontium Titanate Crystal

Cited by 42 publications

References 3 publications

Advances in computational studies of energy materials

Advances in computational studies of energy materials

Point Defect Energies for Strontium Titanate: A Pair-Potentials Study

Pressure dependence of ferroelectric quantum critical fluctuations

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