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Effects of trilinear symmetry breaking on the Potts-model transition of uniaxially stressed SrTiO 3

By Jose Fernando Fontanari and Walter Karl Theumann


A Landau analysis shows that a break of trilinear symmetry in the continuous three-state Potts model with linear and quadratic symmetry breaking is re1evant for the trigonal-to-pseudotetragonal phase transition in uniaxially stressed SrTi03 along [1 +δ 1 +δ 1-2δ], and that the effects of quartic symmetry breaking are vanishingly small. The shift of the tricritical stress parameter δc, is large enough to mask fluctuation corrections to δt/δc in d=4 - € dimensions, anda number of quantitative results for the phase diagrams are obtained

Topics: Fisica da materia condensada, Quebra de simetria, Teoria de redes e estatistica
Year: 2014
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