Crystal Growth, Structural, Electrical, and Magnetic Properties of Mixed-Valent Compounds YbOs2Al10 and LuOs2Al10

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• 作者：Xu Zhang ; Wei Yi ; Kai Feng ; Desheng Wu ; Yifeng Yang ; Ping Zheng ; Jiyong Yao ; Yoshitaka Matsushita ; Akira Sato ; Hongwei Jiang ; Hai Wang ; Youguo Shi ; Kazunari Yamaura ; Nanlin Wang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：May 5, 2014
• 年：2014
• 卷：53
• 期：9
• 页码：4387-4393
• 全文大小：426K
• 年卷期：v.53,no.9(May 5, 2014)
• ISSN：1520-510X

文摘

Single crystals of YbOs₂Al₁₀ and LuOs₂Al₁₀ were grown for the first time using an aluminum self-flux method. The compounds crystallized into a cagelike structure in space group Cmcm, similar to the prototype compound YbFe₂Al₁₀. YbOs₂Al₁₀ exhibited a mixed-valent nature, as determined by magnetic susceptibility measurements over a wide temperature range from 2 to 900 K, in which the inter鈥揷onfiguration鈥揻luctuation model revealed a broad peak around 400 K. In contrast, LuOs₂Al₁₀ displayed Pauli-like paramagnetic behavior over the same temperature range. Both compounds were metallic in nature between 2 and 300 K. The electronic specific heat coefficient of 21.3(2) mJ mol^鈥? K^鈥? for YbOs₂Al₁₀ was determined to be larger than that for LuOs₂Al₁₀ [8.9(1) mJ mol^鈥? K^鈥?], reflecting the mixed-valent nature of the former. First-principles calculations predicted the presence of a mixed-valent state in YbOs₂Al₁₀, in agreement with the experimental observations. The novel compound YbOs₂Al₁₀ elucidates the evolution of the mixed-valent nature of the Yb-based ternary transition metal aluminides from the 3d to 5d elements.