期刊
INORGANIC CHEMISTRY
卷 53, 期 9, 页码 4387-4393出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic403168v
关键词
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资金
- Ministry of Science and Technology of China (973 Project) [2011CB921701, 2011CBA00110]
- National Natural Science Foundation of China [11274367, 11174339, 91122034]
- Chinese Academy of Sciences
- World Premier International Research Center of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- Japan Society for the Promotion of Science (JSPS) [25289233]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program), Japan
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-configuration-fluctuation model revealed a broad peak around 400 K. In contrast, LuOs2Al10 displayed Pauli-like para-magnetic 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(-1) K-2 for YbOs2Al10 was determined to be larger than that for LuOs2Al10 [8.9(1) mJ mol(-1) K-2], 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.
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