Phenomenological theory of a scalar electronic order: application to skutterudite PrFe4P12

Details Phenomenological theory of a scalar electronic order: application to skutterudite PrFe4P12 Phenomenological theory of a scalar electronic order: application to skutterudite PrFe4P12

2008-04-16

arxiv.org/abs/0804.2523v1

J. Phys. Soc. Jpn. 77 (2008) 034602

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 9 figures

Scientific paper

10.1143/JPSJ.77.034602

By phenomenological Landau analysis, it is shown that a scalar order parameter with the point-group symmetry $\Gamma_{1g}$ explains most properties associated with the phase transition in PrFe$_4$P$_{12}$ at 6.5 K. The scalar-order model reproduces magnetic and elastic properties in PrFe$_4$P$_{12}$ consistently such as (i) the anomaly of the magnetic susceptibility and elastic constant at the transition temperature, (ii) anisotropy of the magnetic susceptibility in the presence of uniaxial pressure, and (iii) the anomaly in the elastic constant in magnetic field. An Ehrenfest relation is derived which relates the anomaly of the magnetic susceptibility to that of the elastic constant at the transition.

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