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

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dc.contributor.authorMasingboon, C.
dc.contributor.authorEknapakul, T.
dc.contributor.authorSuwanwong, S.
dc.contributor.authorBuaphet, P.
dc.contributor.authorNakajima, H.
dc.contributor.authorMo, S. -K.
dc.contributor.authorThongbai, P.
dc.contributor.authorKing, P. D. C.
dc.contributor.authorMaensiri, S.
dc.contributor.authorMeevasana, W.
dc.date.accessioned2014-01-09T11:31:01Z
dc.date.available2014-01-09T11:31:01Z
dc.date.issued2013-05-20
dc.identifier70616367
dc.identifier57568ece-0d3e-4fc4-b0e1-a263bf1895a7
dc.identifier000320619300061
dc.identifier84878354044
dc.identifier.citationMasingboon , C , Eknapakul , T , Suwanwong , S , Buaphet , P , Nakajima , H , Mo , S -K , Thongbai , P , King , P D C , Maensiri , S & Meevasana , W 2013 , ' Anomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiation ' , Applied Physics Letters , vol. 102 , no. 20 , 202903 . https://doi.org/10.1063/1.4807741en
dc.identifier.issn0003-6951
dc.identifier.urihttps://hdl.handle.net/10023/4327
dc.description.abstractThe 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.
dc.format.extent5
dc.format.extent611189
dc.language.isoeng
dc.relation.ispartofApplied Physics Lettersen
dc.subjectCopper-titanateen
dc.subjectSRTIO3en
dc.subjectCapacitanceen
dc.subjectDielectric constanten
dc.subjectVacanciesen
dc.subjectPhotoemissionen
dc.subjectQC Physicsen
dc.subject.lccQCen
dc.titleAnomalous change in dielectric constant of CaCu3Ti4O12 under violet-to-ultraviolet irradiationen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.identifier.doi10.1063/1.4807741
dc.description.statusPeer revieweden


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