Muon spin rotation study of the topological superconductor SrxBi2Se3

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 $\lambda \ge 2.3\mu$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 $T\to 0$. The data provide microscopic evidence for a superconducting volume fraction of $\sim 70\%$ in the $x=0.18$ crystal and thus bulk superconductivity.

arXiv comment6 pages, includes 4 figures

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