Abstract
Research on possible topological superconductivity has grown rapidly over the past several years, from fundamental studies to the development of next generation technologies. Recently, it has been reported that the SrxBi2Se3 exhibits superconductivity with topological surface state, making this compound a promising candidate for investigating possible topological superconductivity. However, whether or not the topological surface state is robust against impurities is not clear in this system. Here we report a detailed investigation on the lattice structure, electronic and magnetic properties, as well as the topological superconducting properties of SrxBi2Se3−ySy samples. It is found that the superconducting transition temperature keeps nearly unchanged in all samples, despite of a gradual decrease of the superconducting shielding volume fraction with increasing S doping content. Meanwhile, the Shubnikov-de Hass oscillation results of the SrxBi2Se3−ySy samples reveal that the topological surface states are destroyed in S doped samples, suggesting the topological character is degraded by nonmagnetic dopants.
Highlights
An eBΓ) where An is the extremal cross-sectional area of the Fermi surface (FS) related to the Landau level (LL) n
The prediction of topologically nontrivial superconductivity in SrxBi2Se3
It is found that the isovalent S doping at the Se site does not lead to any noticeable change in the charge carrier density, which is of particular importance in identification of the intrinsic effects of S doping in a topological compound
Summary
Γ) where An is the extremal cross-sectional area of the Fermi surface (FS) related to the Landau level (LL) n. The existence of a nontrivial Berrys phase (γ = 0.53) suggests the existence of surface states in the SrxBi2Se3S system, which is consistent with previous SdH oscillation and angle-resolved photoemission spectroscopy results[23,24,25]. These results suggest that the topological features in the SrxBi2Se3 compound is gradually destroyed with nonmagnetic S doping. The present study reveals that the topological character can be sensitive to nonmagnetic S dopants in SrxBi2Se3 compound. We find that the nonmagnetic S dopants destroys the topological surface states of the SrxBi2Se3 system
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