Direct observation of the quantum fluctuation controlled by ultraviolet irradiation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Sr</mml:mi><mml:mi>Ti</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Nozawa, Shiro; Iwazumi, Toshiaki; Osawa, Hitoshi

doi:10.1103/physrevb.72.121101

Cited by 54 publications

(43 citation statements)

References 21 publications

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“…17 and 18) at temperatures below $100K, reportedly occurring due to small polaron formation with photo-excited carriers in the quantum paraelectric phase of these compounds. 19 In this work, we observe a striking lightinduced enhancement of the dielectric constant in CCTO. This is pronounced even at room temperature, promising applications in light-sensitive electronic devices.…”

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confidence: 72%

Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

Masingboon

Eknapakul

Suwanwong

et al. 2013

Applied Physics Letters

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The influence of light illumination on the dielectric constant of CaCu3Ti4O12 (CCTO) polycrystals is studied in this work. When exposed to 405-nm laser light, a reversible enhancement in the room temperature capacitance as high as 22% was observed, suggesting application of light-sensitive capacitance devices. To uncover the microscopic mechanisms mediating this change, we performed electronic structure measurements, using photoemission spectroscopy, and measured the electrical conductivity of the CCTO samples under different conditions of light exposure and oxygen partial pressure. Together, these results suggest that the large capacitance enhancement is driven by oxygen vacancies induced by the irradiation.

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confidence: 72%

Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

Masingboon

Eknapakul

Suwanwong

et al. 2013

Applied Physics Letters

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“…But one can also observes several other features, labelled α, δ and δ'. The interpretation of these peaks has been widely discussed [28][29][30] , but a general assessment 28,29,31 can be given. The α peak is of quadrupolar origin (t 2g ); the β peak is dipolar in nature but includes also a small (e g ) quadrupolar contribution; and the peaks δ and δ' are pure dipolar features.…”

Section: Resultsmentioning

confidence: 99%

High-pressure dependent ferroelectric phase transition in lead titanate

et al. 2007

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Ti K edge x-ray absorption near-edge structure (XANES) measurements across the pressure induced ferroelectric (FE)-paraeletric (PE) phase transition in PbTiO 3 a prototypical ferroelectric perovskite, are reported for the first time. A quantitative analysis of the XANES allows us to obtain the relative local displacement, directly related to the local electric polarization, of Ti and Pb atoms under pressure. In particular, we found that above the critical pressure, in the so-called cubic-paraelectric phase, the Ti atoms remain locally displaced from their cubic site indicating that this phase transition has in a general way an essential order-disorder component. However the magnitude of these local displacements is strongly affected by the applied pressure as opposed to what happens as a function of temperature. These conclusions have important consequences in the long standing controversial debate on the interpretation of the ferroelectric phase transition of PbTiO 3 , and related family compounds.

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“…Three features, labeled A, B, C, are clearly observable in the pre-edge part of the spectra and their relative intensities differ for the two perovskites. The origin of these features has been widely discussed [1,[9][10][11][12][13] and is still a subject of controversy. Nevertheless a general assessment of these features can be given.…”

Section: Methodsmentioning

confidence: 99%

X-ray absorption spectroscopy on titanate perovskites at the Ti K edge

Itié

Couzinet

Dhaussy

et al. 2006

High Pressure Research

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The Ti K edge X-ray absorption has been measured under high pressure at room temperature for ATiO3 perovskites (A = Ca, Sr, Ba and Pb). The pre-edge features have been used to determine the local distortion around the Ti atom as a function of applied features. The ferroelectric local instability decreases when pressure is increased (PbTiO3 ) and eventually vanishes at high pressure (BaTiO3 ). The antiferrodistorsive instability remains unchanged under pressure for CaTiO3 and appears above 5 GPa for SrTiO3 . Moreover, it is shown that at room pressure SrTiO3 was locally ferroelectric. A new phase appears for SrTiO3 above 14 GPa with a strong deformation of the oxygen octahedron

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Direct observation of the quantum fluctuation controlled by ultraviolet irradiation inSrTiO3

Cited by 54 publications

References 21 publications

Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation

High-pressure dependent ferroelectric phase transition in lead titanate

X-ray absorption spectroscopy on titanate perovskites at the Ti K edge

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