Photoconductivity and the structural phase transition in SrTiO3 |
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Authors: | F Rossella P Galinetto V Trepakov L Jastrabik |
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Institution: | a Dipartimento di Física “A. Volta”, Università di Pavia, CNISM-1-27100 Pavia, Italy b Institute of Physics, AS CR, Na Slovance 2, 182 21, Prague 8, Czech Republic c A. F. Ioffe Physical-Technical Institute, 194 021, St.-Petersburg, Russia |
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Abstract: | Detailed photoconductivity measurements have been performed in nominally pure SrTiO3 in order to elucidate the effect of the antiferrodistorsive cubic-tetragonal phase transition. Small features in the photoconductivity’s temperature dependence in the phase transition region were found using low intensity interband UV or 514 nm light illumination. Such features are associated with a transformation of the defect system controlling the photoconductivity. At the same time, the temperature behavior of the photoconductivity spectral maximum reveals a rather unusual feature which is connected with changes in the absorption band edge structure in the phase transition region. |
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Keywords: | 72 20 i 72 40 +w 72 80 sk |
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