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

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arxiv 2011.05470 v1 pith:H44YVSRD submitted 2020-11-11 cond-mat.supr-con

Dongfei Wang , Jens Wiebe , Ruidan Zhong , Genda Gu , Roland Wiesendanger This is my paper
classification cond-mat.supr-con
keywords statesboundspinsuperconductoratomsfete0signaturespin-polarized
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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.

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