Landau's Theory of Second‐Order Phase Transitions and the Magnetic Phase Transitions in Some Antiferromagnetic Oxides

A. P. Cracknell, M. F. Cracknell, B. L. Davies

doi:10.1002/pssb.19700390212

Landau's Theory of Second‐Order Phase Transitions and the Magnetic Phase Transitions in Some Antiferromagnetic Oxides

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<jats:title>Abstract</jats:title><jats:p>It is argued that many magnetic phase transitions are not, according to Landau's theory, strictly second‐order phase transitions. A detailed discussion of the application of Landau's theory of second‐order phase transitions to antiferromagnetic UO<jats:sub>2</jats:sub>, MnO, FeO, CoO, and NiO is given in terms of Jahn‐Teller distortions and of soft phonon modes.</jats:p>