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Salje EK, Guennou M, Bouvier P, et al. High pressure ferroelastic phase transition in SrTiO₃. J Phys Condens Matter. 2011;23(27):275901doi: 10.1088/0953-8984/23/27/275901.
Salje, E. K., Guennou, M., Bouvier, P., Carpenter, M. A., & Kreisel, J. (2011). High pressure ferroelastic phase transition in SrTiO₃. Journal of physics. Condensed matter : an Institute of Physics journal, 23(27), 275901. https://doi.org/10.1088/0953-8984/23/27/275901
Salje, E K H, et al. "High pressure ferroelastic phase transition in SrTiO₃." Journal of physics. Condensed matter : an Institute of Physics journal vol. 23,27 (2011): 275901. doi: https://doi.org/10.1088/0953-8984/23/27/275901
Salje EK, Guennou M, Bouvier P, Carpenter MA, Kreisel J. High pressure ferroelastic phase transition in SrTiO₃. J Phys Condens Matter. 2011 Jul 13;23(27):275901. doi: 10.1088/0953-8984/23/27/275901. Epub 2011 Jun 17. PMID: 21685556.
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J Phys Condens Matter. 2011 Jul 13;23(27):275901. doi: 10.1088/0953-8984/23/27/275901. Epub 2011 Jun 17.

High pressure ferroelastic phase transition in SrTiO₃.

Journal of physics. Condensed matter : an Institute of Physics journal

E K H Salje, M Guennou, P Bouvier, M A Carpenter, J Kreisel

Affiliations

  1. Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK.

PMID: 21685556 DOI: 10.1088/0953-8984/23/27/275901

Abstract

High pressure measurements of the ferroelastic phase transition of SrTiO₃ (Guennou et al 2010 Phys. Rev. B 81 054115) showed a linear pressure dependence of the transition temperature between the cubic and tetragonal phase. Furthermore, the pressure induced transition becomes second order while the temperature dependent transition is near a tricritical point. The phase transition mechanism is characterized by the elongation and tilt of the TiO₆ octahedra in the tetragonal phase, which leads to strongly nonlinear couplings between the structural order parameter, the volume strain and the applied pressure. The phase diagram is derived from the Clausius-Clapeyron relationship and is directly related to a pressure dependent Landau potential. The nonlinearities of the pressure dependent strains lead to an increase of the fourth order Landau coefficient with increasing pressure and, hence, to a tricritical-second order crossover. This behaviour is reminiscent of the doping related crossover in isostructural KMnF₃.

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