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.

6 pages, includes 4 figures

References in corpus (7)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Classification of topological insulators and superconductors in three spatial dimensions
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
• Local Measurements of the Superconducting Pairing Symmetry in CuxBi2Se3
• Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
• High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor SrxBi2Se3

Cited by in corpus (7)

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• Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological Nb0.25Bi2Se3
• Nematic superconductivity in the topological semimetal CaSn${}_3$
• Ionic and electronic properties of the topological insulator Bi${}_2$Te${}_2$Se investigated using $\beta$-detected nuclear magnetic relaxation and resonance of ${}^8$Li
• Broken time-reversal symmetry in cubic skutterudite-like superconductor Y${}_3$Ru${}_4$Ge${}_{13}$