Order parameters in the Verwey phase transition

Details Order parameters in the Verwey phase transition Order parameters in the Verwey phase transition

2008-01-09

arxiv.org/abs/0801.1420v1

Journal of Physics: Conference Series 92 (2007) 012164

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure

Scientific paper

10.1088/1742-6596/92/1/012164

The Verwey phase transition in magnetite is analyzed on the basis of the Landau theory. The free energy functional is expanded in a series of components belonging to the primary and secondary order parameters. A low-temperature phase with the monoclinic P2/c symmetry is a result of condensation of two order parameters X_3 and \Delta_5 . The temperature dependence of the shear elastic constant C_44 is derived and the mechanism of its softening is discussed.

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