Superconducting properties of Cu intercalated Bi${}_2$Se${}_3$ studied by Muon Spin Spectroscopy

Abstract

We present muon spin rotation measurements on superconducting Cu intercalated Bi${}_2$Se${}_3$, which was suggested as a realization of a topological superconductor. We observe a clear evidence of the superconducting transition below 4 K, where the width of magnetic field distribution increases as the temperature is decreased. The measured broadening at mK temperatures suggests a large London penetration depth in the $ab$ plane (${\lambda }_{\mathrm{eff}}\sim 1.6$ $\mu$m). We show that the temperature dependence of this broadening follows the BCS prediction, but could be consistent with several gap symmetries.

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• A comprehensive review on topological superconducting materials and interfaces
• 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
• Penetration depth and gap structure in the antiperovskite oxide superconductor Sr${}_{3-x}$SnO revealed by $\mu$SR
• Broken time-reversal symmetry in cubic skutterudite-like superconductor Y${}_3$Ru${}_4$Ge${}_{13}$