Low lattice-thermal conductivity in a cage-structured compound YbCu9Sn4 with divalent Yb ions
Low lattice-thermal conductivity in a cage-structured compound YbCu9Sn4 with divalent Yb ions
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具有二价 Yb 离子的笼型结构化合物 YbCu9Sn4 的低晶格热导率
DOI：
10.1016/j.jallcom.2014.05.090
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发表时间：
2014
影响因子：
6.2
通讯作者：
Naohito Tsujii
中科院分区：
文献类型：
--
作者：
Kenji Kiyohara;Hiroshi Shioyama;Takushi Sugino;Kinji Asaka;Yasushi Soneda;Kiyoaki Imoto;and Masaya Kodama;Naohito Tsujii
制备了YbCu_9 Sn_4多晶样品，并对其物理性能进行了研究。磁化率显示出弱的抗磁性，表明Yb离子处于Yb ~（2+）态。电阻率表现为正常的金属行为，Seebeck系数小至1 μV/K量级。比热在低温下表现出爱因斯坦模的显著贡献，爱因斯坦温度为67 K。晶格热导率被发现是小至2.7 W/Km低于室温。这些结果表明，Cu-Sn笼内的Yb离子表现出晃动，这降低了YbCu 9 Sn 4的晶格热导率。
Polycrystalline sample of YbCu9Sn4has been prepared and the physical properties have been investigated. Magnetic susceptibility shows a weak diamagnetism, indicating the Yb ions are in the nonmagnetic Yb2+state. Electrical resistivity shows a normal metallic behavior and Seebeck coefficient is as small as the order of 1 μV/K. Specific heat reveals the prominent contribution of Einstein mode at low temperature with the Einstein temperature of 67 K. Lattice thermal conductivity is found to be as small as 2.7 W/Km below room temperature. These results demonstrate that the Yb ions inside the Cu–Sn cage exhibit rattling, which reduces the lattice thermal conductivity of YbCu9Sn4.