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Recently, the niobium (Nb)-doped topological insulator Bi_2Se_3, in which thefinite magnetic moments of the Nb atoms are intercalated in the van der Waalsgap between the Bi_2Se_3 layers, has been shown to exhibit bothsuperconductivity with T_c = 3 K and topological surface states. Here we reporton muon spin rotation experiments probing the temperature-dependent ofeffective magnetic penetration depth Lambda_eff(T) in the layered topologicalsuperconductor candidate Nb_0.25Bi_2Se_3. The exponential temperaturedependence of lambda_(eff)^(-2)(T) at low temperatures suggests a fully gappedsuperconducting state in the bulk with the superconducting transitiontemperature T_c = 2.9 K and the gap to T_c ratio 2Delta/k_BT_c = 3.95(19). Wealso revealed that the ratio T_c/lambda_(eff)^(-2) is comparable to those ofunconventional superconductors, which hints at an unconventional pairingmechanism. Furthermore, time reversal symmetry breaking was excluded in thesuperconducting state with sensitive zero-field muSR experiments. We hope thepresent results will stimulate theoretical investigations to obtain amicroscopic understanding of the relation between superconductivity and thetopologically non-trivial electronic structure of Nb_0.25Bi_2Se_3.

Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological Nb0.25Bi2Se3