## Abstract

The authors study the phase diagrams of SrTiO_{3} as function of temperature and of uniaxial stress along a general direction. In particular, new results are presented for stress along (110) and along (1+ delta , 1+ delta , 1-2 delta ). In the latter case, the trigonal pseudotetragonal phase transition is described by a three-state Potts model Hamiltonian with both quadratic and linear symmetry-breaking fields. Far away from the (zero-stress) multicritical point, the leading fluctuations are described by the underlying XY model. The first-order Potts model transition is turned second order by the symmetry-breaking fields via a tricritical point, at delta _{t}(<0), and at a critical point, delta _{c}(>0). The universal ratio delta _{t}/ delta _{c} is calculated to order epsilon =4-d. In the close vicinity of the multicritical point, the XY model underlying all of these results undergoes a crossover to a Gaussian model, and the Potts line approaches the temperature axis tangentially.

Original language | English |
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Article number | 005 |

Pages (from-to) | 1919-1944 |

Number of pages | 26 |

Journal | Journal of Physics C: Solid State Physics |

Volume | 14 |

Issue number | 14 |

DOIs | |

State | Published - 1981 |

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