Scalar Order : Possible Candidate for Order Parameters in Skutterudites(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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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_4P_<12> and PrRu_4P_<12> near their phase transitions is explained within a single framework. For the low-field phase of PrFe_4P_<12>, the scalar order with Г_<1g> 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 ^<31>P nuclear magnetic resonance (NMR) spectra. It is proposed how the order parameter in SmRu_4P_<12> is identified by NMR analysis of a single crystal.
社団法人日本物理学会の論文
2006-10-15