Crossover from fluctuation-driven continuous transitions to first-order transitions

Daniel Blankschtein, Amnon Aharony

Research output: Contribution to journalArticlepeer-review


Near a tricritical point of an n-component spin system, fluctuations turn the first-order transition (predicted by the Landau theory) into second order. We show that when this happens, quadratic anisotropies turn the transition first order again. In systems which exhibit fluctuation-driven first-order transitions, increasing anisotropies yield two consecutive tricritical points. These effects are predicted to result from the application of magnetic fields or uniaxial stresses to MnO, BaTiO3, KTaxNb1-xO3 (KTN), TbP, etc.

Original languageEnglish
Pages (from-to)439-442
Number of pages4
JournalPhysical Review Letters
Issue number6
StatePublished - 1981


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