Phenomenological Landau analysis shows that the properties of ordered phases in some skutterudites are consistently accounted for by a scalar-order parameter which preserves the cubic symmetry, even in the ordered phase. A universal value is found for the anisotropy ratio of the transition temperature in a magnetic field, homogeneous magnetization, and induced staggered magnetization. The difference in magnetic behavior between PrFe 4P12 and PrRu4P12 near their phase transitions is explained within a single framework. For the low-field phase of PrFe4P12, the scalar order with Γ1g symmetry can explain (i) the absence of field-induced dipoles perpendicular to the magnetic field, (ii) isotropic magnetic susceptibility in the ordered phase, (iii) the field-angle dependence of the transition temperature, and (iv) the splitting pattern of the 31P nuclear magnetic resonance (NMR) spectra. It is proposed how the order parameter in SmRu4P 12 is identified by NMR analysis of a single crystal.
|Journal||journal of the physical society of japan|
|Publication status||Published - 2006 Oct|
- Magnetic properties
- Scalar order
ASJC Scopus subject areas
- Physics and Astronomy(all)