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arXiv · 1709.07547

Muon spin rotation study of the topological superconductor SrxBi2Se3

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

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.

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H. Leng, D. Cherian, Y. K. Huang, J. -C. Orain, A. Amato, A. de Visser. 2017-09-22. Muon spin rotation study of the topological superconductor SrxBi2Se3. https://doi.org/10.1103/physrevb.97.054503

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