Evolution of magnetism from mixed-valent CeIr3B2 to trivalent CeIr3Si2.
Evolution of magnetism from mixed-valent CeIr3B2 to trivalent CeIr3Si2.
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磁性从混合价 CeIr3B2 到三价 CeIr3Si2 的演变。
DOI：
10.1103/physrevb.36.8929
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Vijayaraghavan
中科院分区：
文献类型：
--
作者：
Umarji;Dhar;Malik;Vijayaraghavan
三元化合物CeIr/sub 3/B/sub 2/是以单斜结构结晶的混合价材料，与六方CeCo/sub 3/B/sub 2/-型结构密切相关。研究了CeRh/sub 3-//sub y/Ir/sub y/B/sub 2/（y = 0- 2）和CeIr/sub 3/B/sub 2-//sub x/Si/sub x/（x = 0- 2）体系的结构和磁性相图。首次报道了新化合物CeIr/sub 3/Si/sub 2/的性质。结果表明，Rh和Si分别取代Ir和B位后，CeIr/sub 3/B/sub 2/结构转变为六方结构。伴随着结构转变的是混合价Ce原子变得更具磁性的电子跃迁。所观察到的铁磁基态与CeRh/sub 3/B/sub 2/（T/sub C/ = 115 K）中所观察到的铁磁基态相似。mu../ sub sat/ = 0.4.. mu../ sub. B/）。CeT/sub 3/B/sub 2/-型化合物中Ce原子配体的作用及其杂化作用被认为是其具有异常自然磁性的主要原因。
The ternary compound CeIr/sub 3/B/sub 2/ is a mixed-valent material crystallizing in a monoclinic structure, closely related to the hexagonal CeCo/sub 3/B/sub 2/-type structure. The structural and magnetic phase diagrams of the systems CeRh/sub 3-//sub y/Ir/sub y/B/sub 2/ (y = 0--2) and CeIr/sub 3/B/sub 2-//sub x/Si/sub x/ (x = 0--2) have been investigated. Properties of the new compound CeIr/sub 3/Si/sub 2/ have been reported for the first time. It is shown that the structure of CeIr/sub 3/B/sub 2/ transforms to the hexagonal type on substitution of Rh and Si at Ir and B sites, respectively. Accompanying the structural transformation is an electronic transition in which the mixed-valent Ce atoms become more magnetic. The observed ferromagnetic ground state is similar to the one seen in CeRh/sub 3/B/sub 2/ (T/sub C/ = 115 K and ..mu../sub sat/ = 0.4..mu../sub B/). The role of Ce-atom ligands and their hybridization is thought to be the primary cause for the unusual nature magnetism in CeT/sub 3/B/sub 2/-type compounds.