Optical probe of ferroelectric order in bulk and thin-film perovskite titanates

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Authors

ROSSLE Matthias WANG C.N. MARŠÍK Přemysl YAZDI-RIZI M. KIM K.W. DUBROKA Adam MAROZAU I. SCHNEIDER C.W. HUMLÍČEK Josef BAERISWYL Dionys BERNHARD Christian

Year of publication 2013
Type Article in Periodical
Magazine / Source Physical Review B
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://journals.aps.org/prb/abstract/10.1103/PhysRevB.88.104110
Doi http://dx.doi.org/10.1103/PhysRevB.88.104110
Field Solid matter physics and magnetism
Keywords quantum dots; SiGe; photoluminescence; excitonic structure; biexciton
Description We have measured the temperature dependence of the direct band gap Eg in SrTiO3 and BaTiO3 and related materials with quantum-paraelectric and ferroelectric properties using optical spectroscopy. We show that Eg exhibits an anomalous temperature dependence with pronounced changes in the vicinity of the ferroelectric transition that can be accounted for in terms of the Frohlich electron-phonon interaction with an optical phonon mode, the so-called soft mode. In addition, we demonstrate that these characteristic changes of Eg can be readily detected even in very thin films of SrTiO3 with a strain-induced ferroelectric order. Optical spectroscopy thus can be used as a rather sensitive probe of ferroelectric order in very thin films of these titanates and probably also in subsequent multilayers and devices.
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