Verwey相变中的序参量
Order parameters in the Verwey phase transition
摘要：
本文用朗道理论分析了磁铁矿中的Verwey相变。自由能泛函被扩展为一系列属于一级和二级序参量的分量。具有单斜P2/c对称性的低温相是两个序参量X_3和Δ_5凝聚的结果。导出了剪切弹性常数C_44的温度关系，并讨论了其软化机理。
英文摘要：
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 Δ_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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