Spin-polarized Yu-Shiba-Rusinov states in an iron based superconductor

Abstract

Yu-Shiba-Rusinov (YSR) bound states appear when a magnetic atom interacts with a superconductor. Here, we report on spin-resolved spectroscopic studies of YSR states related with Fe atoms deposited on the surface of the topological superconductor FeTe0.55Se0.45 using a spin-polarized scanning tunneling microscope. We clearly identify the spin signature of pairs of YSR bound states at finite energies within the superconducting gap having opposite spin polarization as theoretically predicted. In addition, we also observe zero-energy bound states for some of the adsorbed Fe atoms. In this case, a spin signature is found to be absent indicating the absence of Majorana bound states associated with Fe adatoms on FeTe0.55Se0.45.

18 pages, 6 figures, supplementary Material included

References in corpus (5)

• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Distinguishing a Majorana zero mode using spin resolved measurements
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Orbital Picture of Yu-Shiba-Rusinov Multiplets
• Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)

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