arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.10553cond-mat.supr-con
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超导Cu $_x$ Bi PDMATHAAB Se $_{3}$的晶体结构和畸变

Crystal structure and distortion of superconducting Cu$_x$Bi$_2$Se$_{3}$

Tobias Fröhlich, Zhiwei Wang, Mahasweta Bagchi, Anne Stunault, Yoichi Ando, Markus Braden

摘要:

用单晶中子衍射研究了候选拓扑超导体Cu $_x$ Bi $_2$ Se $_3$的晶体结构。无论是结构的细化,也没有计算的散射密度图发现一个显着的占领Cu在五重层之间的Bi $_2$ Se $_3$的嵌入位置。在布拉格反射强度作为温度的函数之后,在295和2 K之间没有结构相变的特征。然而,大组布拉格反射的分析表明,由于Bi离子的小位移,破坏旋转轴的小结构畸变。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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