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arXiv 1709.07547cond-mat.supr-con
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拓扑超导体SrxBi2Se3的μ子自旋转动研究

Muon spin rotation study of the topological superconductor SrxBi2Se3

H. Leng, D. Cherian, Y. K. Huang, J. -C. Orain, A. Amato, A. de Visser

摘要:

本文报道了超导体Sr $_x$ Bi $_2$ Se $_3$单晶的横场(TF)μ子自旋旋转实验,其中$x=0.15$和$0.18$($T_c \sim 3$ K)为标称浓度. TF谱($B= 10$ mT),在现场冷却到低于$T_c$后测量,没有显示任何额外的阻尼的μ子进动信号,由于在实验的不确定性的通量线晶格。这为磁穿透深度$λ\geq 2.3 ~μ$ m设定了下限。然而,当我们通过改变$T_c$下方的磁场来诱导涡旋晶格中的无序时,就会为$T \rightarrow 0$获得相当大的阻尼率。这些数据为$x=0.18$晶体中的$\sim 70~ \%$的超导体积分数提供了微观证据,从而提供了体超导性。

英文摘要:

We report transverse-field (TF) muon spin rotation experiments on single crystals of the topological superconductor Sr$_x$Bi$_2$Se$_3$ with nominal concentrations $x=0.15$ and $0.18$ ($T_c \sim 3$ K). The TF spectra ($B= 10$ mT), measured after cooling to below $T_c$ in field, did not show any additional damping of the muon precession signal due to the flux line lattice within the experimental uncertainty. This puts a lower bound on the magnetic penetration depth $λ\geq 2.3 ~μ$m. However, when we induce disorder in the vortex lattice by changing the magnetic field below $T_c$ a sizeable damping rate is obtained for $T \rightarrow 0$. The data provide microscopic evidence for a superconducting volume fraction of $\sim 70~ \%$ in the $x=0.18$ crystal and thus bulk superconductivity.

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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