TY  - JOUR
AU  - Rütten, Lisa M.
AU  - Liebhaber, Eva
AU  - Reecht, Gaël
AU  - Rossnagel, Kai
AU  - Franke, Katharina J.
TI  - Direct signatures of d-level hybridization and dimerization in magnetic adatom chains on a superconductor
JO  - Nanoscale
VL  - 17
IS  - 46
SN  - 2040-3364
CY  - Cambridge
PB  - RSC Publ.
M1  - PUBDB-2025-05265
SP  - 26811 - 26819
PY  - 2025
N1  - cc-by
AB  - Magnetic adatom chains on superconductors provide a platform to explore correlated spin states and emergent quantum phases. Using low-temperature scanning tunneling spectroscopy, we study the distance-dependent interaction between Fe atoms on 2H-NbSe2. While single atoms exhibit four Yu–Shiba–Rusinov states and partially occupied d levels consistent with a S = 2 spin state, the spin is quenched when two Fe atoms reside in nearest-neighbor lattice sites, where the d levels of the atoms hybridize. The non-magnetic dimer configuration is stable in that dimerization persists in chains with weak interactions among the dimers. Thus, the spin-state quenching has important implications also for Fe chains. While even-numbered chains are stable and non-magnetic, odd-numbered chains host a single magnetic atom at one of the chain's ends, with its position being switchable by voltage pulses. Our findings emphasize the role of interatomic coupling in shaping quantum ground states.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1039/D5NR03194J
UR  - https://bib-pubdb1.desy.de/record/641978
ER  -