Multipolar Interaction Derived from d–f Hybridization in Pr-Based Filled Skutterudite Compounds

Multipolar Interaction Derived from d–f Hybridization in Pr-Based Filled Skutterudite Compounds
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Pr基填充方钴矿化合物中d-f杂化衍生的多极相互作用

DOI:
10.1143/jpsj.81.024706
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发表时间:
2012
影响因子:
1.7
通讯作者:
R. Shiina
R. Shiina
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
R. Shiina

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方钨矿化合物的导电带由氧原笼的p轨道和过渡金属离子的d轨道组成。在本文中,我们讨论了d带与局域化的4 f态之间的杂化对pr基填充方晶石中多极矩的排序和涨落的影响。首先,我们在紧束缚带模型的框架下研究了围绕区域中心的非简并d带的性质。引入d - f杂化的一种现实形式,我们证明了a - g带只能与f电子的Γ 8轨道杂化。然后,我们从f电子局域限制的杂化中推导出d - f多极相互作用,其中基态被限制为单重态-三重态晶体场态。发现在单重态基态下,O x y型的四极相互作用占主导地位,而三重态基态则明显有利于磁相互作用。relati……
The conduction bands of the skutterudite compounds are composed of p orbitals of the pnictogen cages and d orbitals of the transition metal ions. In this paper, we address the effect of hybridization between the d bands and localized 4 f states in relation with ordering and fluctuation of multipole moments in Pr-based filled skutterudites. First, we study the properties of a non-degenerate d band around the zone center in the framework of a tight-binding band model. Introducing a realistic form of the d – f hybridization, we show that the a g band can be hybridized only with the Γ 8 orbitals of f electrons. Then, we derive d – f multipolar interactions from the hybridization in the localized limit of f electrons in which the basis states are restricted to the singlet–triplet crystal field states. It is found that the quadrupolar interaction of the O x y -type becomes predominant in the case of the singlet ground state, whereas the triplet ground state apparently favors the magnetic interaction. The relati...
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