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Critical exponents for isosymmetric phase transitions in BiFeO₃
1Physics Department, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.
Abstract:
Recent studies of BiFeO(3) have revealed two first-order phase transitions that do not change symmetry (Pbnm-Pbnm at approx. 1200 K and Cc-Cc under uniaxial stress). Twenty years ago Ishibashi and Hidaka (1991 J. Phys. Soc. Japan 60 1634) showed that such systems generally exhibit a phase diagram with tricritical points and critical end points and gave the unusual mean-field critical exponents α = 2/3, β = 1/3 and γ = 2/3 at the end points. In the present paper I extend that to show δ = 3, ν = 1/3 and η = 0 and suggest some experimental tests.
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