Stoner-enhanced paramagnetism in tungsten tetraboride
Stoner-enhanced paramagnetism in tungsten tetraboride
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DOI：
10.1088/0953-8984/28/2/026005
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
J. Shen;Jingming Zhou;Meng Zhao;G. Liu;Ju Gao;Jinlei Yao
中科院分区：
文献类型：
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作者：
J. Shen;Jingming Zhou;Meng Zhao;G. Liu;Ju Gao;Jinlei Yao
我们通过磁化强度和比热测量证明，四硼化钨（WB4）是一种不含磁性原子的重过渡金属化合物，是一种交换增强顺磁体。 WB4的有效磁矩较小，为0.53 μB/fu。 10 K以下1 memu (mol·Oe)−1量级的高磁化率服从二次温度依赖性。低温下 CP/T 相对于 T2 的上升行为归因于电子-顺磁振子相互作用。基于Stoner模型推导出高Stoner增强参数Z = 0.93来解释增强的顺磁性。
We demonstrate that tungsten tetraboride (WB4), a heavy transition metallic compound without magnetic atoms, is an exchange-enhanced paramagnet revealed by the magnetization and specific heat measurements. WB4 has a small effective magnetic moment of 0.53 μB/fu. The high magnetic susceptibility in the magnitude of 1 memu (mol·Oe)−1 below 10 K obeys quadratic temperature dependence. The upturn behavior of CP/T versus T2 at low temperatures is attributed to the electron-paramagnon interactions. A high Stoner enhancement parameter, Z = 0.93, was derived to explain the enhanced paramagnetism based on the Stoner model.