论文标题
SR $ _ {0.1} $ BI $ _2 $ SE $ _3 $的超导过渡的多模式同步X射线衍射
Multimodal synchrotron X-ray diffraction across the superconducting transition of Sr$_{0.1}$Bi$_2$Se$_3$
论文作者
论文摘要
在掺杂的拓扑绝缘子SR $ _x $ bi $ _2 $ se $ _3 $中，在超导过渡温度$ t_c \ sim $ 3 k的电子属性中观察到了平面内两倍的对称性，尽管观察到的$ r \ r \ r \ r \ r \ bar $ $ $ $ $ $ $ 3} m $ $ $ $ 3} m $ 3} m $ 3} m $ 3} m $ 3} m $ $ $ $ $ $ $ $。两倍对称性的轴名义上固定在三个旋转等效方向之一中之一，并且已经提议晶体学应变是该固定的起源。我们在SR $ _ {0.1} $ _ {0.1} $ _2 $ _2 $ SE $ _3 $的单个晶体上进行了多模式同步器衍射和电阻率测量，并在磁场上降至$ 0.68 k $ 0.68 k，并在高达45 kg的磁场上，以探测晶体造成扭曲的超管效应的效果。我们的结果表明，在$ 1x10^{ - 5} $的水平上没有平面内晶体学失真，与超导过渡相关。这些结果进一步支持了这样的模型，即SR $ _x $ _x $ _x $ bi $ _2 $ _2 $ sr $ _3 $的超导特性的大两个面式各向异性不是结构性的，而是电子的，即是由EU Symmetry的Nematic Superconcoting Ardosing Ardosing symmetry造成的。
In the doped topological insulator Sr$_x$Bi$_2$Se$_3$, a pronounced in-plane two-fold symmetry is observed in electronic properties below the superconducting transition temperature $T_c \sim$ 3 K, despite the three-fold symmetry of the observed $R\bar{3}m$ space group. The axis of two-fold symmetry is nominally pinned to one of three rotational equivalent directions and crystallographic strain has been proposed to be the origin of this pinning. We carried out multimodal synchrotron diffraction and resistivity measurements down to $\sim$0.68 K and in magnetic fields up to 45 kG on a single crystal of Sr$_{0.1}$Bi$_2$Se$_3$ to probe the effect of superconductivity on the crystallographic distortion. Our results indicate that there is no in-plane crystallographic distortion at the level of $1x10^{-5}$ associated with the superconducting transition. These results further support the model that the large two-fold in-plane anisotropy of superconducting properties of Sr$_x$Bi$_2$Sr$_3$ is not structural in origin but electronic, namely it is caused by a nematic superconducting order parameter of Eu symmetry.
