方钴矿中序参量的确定--强关联物理的一个奇妙之地--
Toward Identification of Order Parameters in Skutterudites - a Wonderland of Strong Correlation Physics -
摘要：
介绍了目前在具有独特有序现象的填充方钴矿中识别非常规序参量的研究现状。讨论了PrFe $_4$ P $_{12}$和PrRu $_4$ P $_{12}$中的序参量与相关的晶体电场（CEF）态和角形状因子的关系。通过唯象的Landau分析，证明了标量有序模型解释了PrFe $_4$ P $_{12}$和PrRu $_4$ P $_{12}$的大部分性质，但它们的磁性质有很大的不同.特别是，在PrFe $_4$ P $_{12}$单轴压力引起的高度各向异性的磁化率解释两种类型的耦合。在SmRu $_4$ P $_{12}$的情况下，在低场的主要序参量被确定为磁八极。提出了方钴矿点群$T_h$下偶极和八极自由度混合的微观机制。
英文摘要：
Current status is described toward identifying unconventional order parameters in filled skutterudites with unique ordering phenomena. The order parameters in PrFe$_4$P$_{12}$ and PrRu$_4$P$_{12}$ are discussed in relation to associated crystalline electric field (CEF) states and angular form factors. By phenomenological Landau analysis, it is shown that a scalar order model explains most properties in both PrFe$_4$P$_{12}$ and PrRu$_4$P$_{12}$ with very different magnetic properties. In particular, the highly anisotropic susceptibility induced by uniaxial pressure in PrFe$_4$P$_{12}$ is explained in terms of two types of couplings. In the case of SmRu$_4$P$_{12}$, the main order parameter at low field is identified as magnetic octupoles. A microscopic mechanism is proposed how the dipole and octupole degrees of freedom mix under the point group $T_h$ of skutterudites.
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