Change of magnetic and electronic features through subtle substitution in cubic, non-centrosymmetric extended rare-earth metal cluster complexes {TR₃}X₃

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• 作者：Simon Steinberg ; Martin Valldor ; Gerd Meyer
• 关键词：Rare earth metals ; Cluster ; Cluster complex ; Magnetism
• 刊名：Journal of Solid State Chemistry
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：206
• 期：Complete
• 页码：176-181
• 全文大小：1624 K

文摘

The new compound {IrCe₃}I₃ was synthesized by comproportionation reactions of stoichiometric ratios of CeI₃, Ce and Ir. Single crystal X-ray diffraction structure determination shows that {IrCe₃}I₃ crystallizes with the cubic variant of the {TR₃}X₃ family (I4₁32, Z=8, a=12.450(1) ?, V=1930.0(3) ?³) and is isostructural with the recently reported {RuLa₃}Br₃. Octahedral {IrCe₆} clusters share three common edges forming interpenetrating chains that run along the 4₁ screw axes. Magnetic measurements on pure powder samples of {IrCe₃}I₃ show paramagnetic behavior and, at temperatures below 2 K, a mictomagnetic state. The isostructural {RuLa₃}Br₃ is a Pauli paramagnet suggesting metallic conductivity which is consistent with band structure calculations where the Fermi level is placed below a pseudogap. For {IrCe₃}I₃, on the contrary, the Fermi level falls in a narrow gap rather than a pseudogap suggesting activated conductivity.