Physics – Condensed Matter – Materials Science
Scientific paper
2012-01-16
Physics
Condensed Matter
Materials Science
9 pages, 7 figures, 26 references
Scientific paper
The 105 K second-order displacive phase transition of SrTiO3 has been studied with the help of Electron Paramagnetic Resonance. The photochromic non-cubic Fe5+ centre is used as local probe. Critical phenomena, characterized by an exponent {\beta} = 1/3, are presented. Line broadening effects are interpreted as stemming from time-dependent fluctuations near the phase transition point. The data are consistent with those reported earlier on the Fe3+-VO pair centre, indicating cooperative effects in the crystal. Also a model for the non-cubic Fe5+ is proposed, i.e., the ion is substitutional for Ti4+ with an empty adjacent expanded octahedron. Other Fe5+ centres in SrTiO3 and BaTiO3 are reviewed and reinterpreted.
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