论文标题
超导cu $ _x $ bi $ _2 $ se $ _ {3} $的晶体结构和失真
Crystal structure and distortion of superconducting Cu$_x$Bi$_2$Se$_{3}$
论文作者
论文摘要
候选拓扑超导体Cu $ _x $ _2 $ _2 $ se $ _3 $的晶体结构使用单晶中性衍射研究了通过在Cu二元插入电化学上获得的样品。结构修补或计算得出的散射密度地图都没有在bi $ _2 $ _2 $ se $ _3 $之间的互相位置上发现Cu的重大职业。在布拉格反射强度作为温度的函数之后，没有结构相变的标志在295至2 K之间。但是，对大型布拉格反射的分析表明，由于双离子的小位移，旋转轴破坏了旋转轴的小小很小。
The crystal structure of the candidate topological superconductor Cu$_x$Bi$_2$Se$_3$ was studied by single-crystal neutron diffraction using samples obtained by inserting the Cu dopant electrochemically. Neither structural refinements nor calculated scattering-density maps find a significant occupation of Cu at the intercalation site between the quintuple layers of Bi$_2$Se$_3$. Following Bragg reflection intensities as function of temperature, there is no signature of a structural phase transition between 295 and 2 K. However, the analysis of large sets of Bragg reflections indicates a small structural distortion breaking the rotational axis due to small displacements of the Bi ions.
