Journal of Solid State Chemistry ( IF 3.3 ) Pub Date : 2018-03-27 , DOI: 10.1016/j.jssc.2018.03.029 Wei Han , Zhen Wang , Qidong Li , Xin Lian , Xudong Liu , Qinghua Fan , Yanming Zhao
In this paper, we report the study of transport and magnetic properties of ytterbium hexaboride (YbB6) nanowires grown by a low trigger-temperature (200–240 °C) solid state method. The temperature dependence of resistivity shows that the YbB6 nanowire undergoes a semiconductor-insulator transition (SIT) below 20 K with an activation energy ΔE of 1 meV. The value of ρ at 2 K reaches 49 times the value of ρ at 300 K (ρ2 K/ρ300 K = 49). The observed non-saturating magnetoresistance (MR) has a linear relationship with B2. The anomalous electronic transport in the YbB6 nanowire can be explained by the mixed valence of Yb ions due to the boron deficiency supporting by the X-ray photoelectron spectroscopy (XPS) and paramagnetic magnetization.
中文翻译:
含硼空位的YbB 6纳米线中的半导体-绝缘体转变
在本文中,我们报告了通过低触发温度(200–240°C)固态方法生长的六硼化y(YbB 6 )纳米线的传输和磁性能的研究。电阻率的温度依赖性表明,YbB 6纳米线在20 K以下经历了半导体-绝缘体跃迁(SIT),其活化能ΔE为1 meV。2 K时的ρ值达到300 K时的ρ值的49倍(ρ2 K / ρ300 K = 49)。观察到的非饱和磁阻(MR)与B 2具有线性关系。YbB 6中的异常电子传输纳米线可以通过X射线光电子能谱(XPS)和顺磁磁化作用支持的硼缺乏来解释Yb离子的混合价。