Journal article

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

  • Rössle, Matthias University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Wang, Chen Nan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Maršík, Premysl University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Yazdi-Rizi, M. University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Kim, Kyung Wan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland - Department of Physics, Chungbuk National University, Korea
  • Dubroka, Adam University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland - Department of Condensed Matter Physics, Faculty of Science, Masaryk University and Central European Institute of Technology, Brno, Czech Republic
  • Marozau, Ivan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Schneider, C. W. Paul Scherrer Institut, Villigen, Switzerland
  • Humlíček, J. Department of Condensed Matter Physics, Faculty of Science, Masaryk University and Central European Institute of Technology, Brno, Czech Republic
  • Baeriswyl, Dionys University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
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    26.09.2013
Published in:
  • Physical Review B. - 2013, vol. 88, no. 10, p. 104110
English 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 Fröhlich 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/303259
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