Corpus ID: 236493422

Two universality classes for the displacive phase transitions in perovskites

  title={Two universality classes for the displacive phase transitions in perovskites},
  author={Amnon Aharony and O. Entin-wohlman},
Perovskites like LaAlO3, (or SrTiO3) undergo displacive structural phase transitions from a cubic crystal to a trigonal (or tertagonal) structure. For many years, the critical exponents in both these types of transitions have been fitted to those of the isotropic three-commponents Heisenberg model. Recent field theoretical accurate calculations showed that this is wrong: the isotropic fixed point of the renormalization group (RG) is unstable, and RG iterations flow either to a ‘cubic’ fixed… Expand

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