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Title: Spin-Polarized Yu-Shiba-Rusinov States in an Iron-Based Superconductor

Journal Article · · Physical Review Letters

Yu-Shiba-Rusinov (YSR) bound states appear when a magnetic atom interacts with a superconductor. In this study, we report on spin-resolved spectroscopic studies of YSR states related with Fe atoms deposited on the surface of the topological superconductor FeTe 0.55 Se 0.45 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 FeTe 0.55 Se 0.45 .

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1771132
Report Number(s):
BNL-221139-2021-JAAM; TRN: US2206885
Journal Information:
Physical Review Letters, Vol. 126, Issue 7; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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