论文标题
探测超导SN4AU单晶的拓扑表面状态：磁铁运输研究
Probing the topological surface states in superconducting Sn4Au single crystal: A magneto transport study
论文作者
论文摘要
表现出散装超导性的材料以及正常状态的磁磁性（MR）已成为拓扑超导性的合适候选物。在本文中，我们报告了一种无通量的方法，可以合成拓扑超导体候选SN4AU的单晶。相纯度和单晶性质通过各种特征证实。 X射线衍射（XRD），场发射扫描电子显微镜（FESEM），选定的面积电子衍射（SAED）和透射电子显微镜（TEM）。组成元件的化学状态。通过X射线光电子光谱（XPS）分析SN和AU。合成的SN4AU单晶中的超导性是R-T图的明显形式，临界场（HC）是通过2K的R-H图确定的，即在2K的临界温度TC以下。在TC上方的不同温度下，在R-H测量中观察到阳性磁扰（MR）。 3K，5K，10K和20K。此外，通过使用hikami-larkin-nagaoka（HLN）形式主义分析磁性电导率（MC），这表明SN4AU中存在弱抗钙化效应（WAL）效应。已经执行了角度依赖的磁输液测量，以检测SN4AU单晶观察到的WAL效应的起源。标准化的MC与Hcostheta图显示了研究系统中拓扑表面状态（TSS）的存在。显然，SN4AU是2.6K拓扑超导体。
Materials exhibiting bulk superconductivity along with magnetoresistance (MR) in their normal state have emerged as suitable candidates for topological superconductivity. In this article, we report a flux free method to synthesize single crystal of topological superconductor candidate Sn4Au. The phase purity and single crystalline nature are confirmed through various characterizations viz. X-Ray diffraction (XRD), field emission scanning electron microscopy (FESEM), selected Area electron diffraction (SAED), and transmission electron microscopy (TEM). Chemical states of the constituent element viz. Sn and Au are analyzed through X-Ray photoelectron spectroscopy (XPS). Superconductivity in synthesized Sn4Au single crystal is evident form R-T plot and critical field (Hc) is determined through R-H plot at 2K i.e., just below critical temperature Tc. A positive magnetoresistance (MR) is observed in R-H measurements at different temperatures above Tc, viz. at 3K, 5K, 10K and 20K. Further, the magnetoconductivity (MC) is analyzed by using Hikami-Larkin-Nagaoka (HLN) formalism, which signifies the presence of weak antilocalization (WAL) effect in Sn4Au. Angle dependent magneto-transport measurement has been performed to detect the origin of the observed WAL effect in Sn4Au single crystal. Normalized MC vs HcosTheta plot shows presence of topological surface states (TSS) in the studied system. It is evident that Sn4Au is a 2.6K topological superconductor.
