论文标题
磁化放松并在构造V-Doped（BI，SB）中寻找磁性差距$ _ 2 $ TE $ _3 $
Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)$_2$Te$_3$
论文作者
论文摘要
V掺杂（BI，SB）$ _ 2 $ te $ _3 $具有比掺杂的磁性相对方高的十倍，因此被认为是量子异常效果（qahe）的出色系统。 QAHE需要在狄拉克点开设磁带隙。我们没有通过X射线磁性圆形二色性（XMCD）直接探测V位点和Zerofield中的磁性的X射线磁性圆形二色性（XMCD），从而通过角度分辨的光电学光谱降低到1 K。 XMCD信号的磁滞曲线表明，固执对磁场的渐变速度的强烈依赖性。 XMCD信号以分钟的时间尺度衰减，我们得出的结论有助于在狄拉克点没有可检测的磁性间隙。
V-doped (Bi,Sb)$_2$Te$_3$ has a ten times higher magnetic coercivity than its Cr-doped counterpart and therefore is believed to be a superior system for the quantum anomalous Hall effect (QAHE). The QAHE requires the opening of a magnetic band gap at the Dirac point. We do not find this gap by angle-resolved photoelectron spectroscopy down to 1 K. By x-ray magnetic circular dichroism (XMCD) we directly probe the magnetism at the V site and in zerofield. Hysteresis curves of the XMCD signal show a strong dependence of the coercivity on the ramping velocity of the magnetic field. The XMCD signal decays on a time scale of minutes which we conclude contributes to the absence of a detectable magnetic gap at the Dirac point.
