Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 64: Surface Magnetism
O 64.2: Vortrag
Mittwoch, 11. März 2026, 15:30–15:45, HSZ/0403
Intra-atomic s-f correlation in a single Sm atom probed by ESR-STM — Masahiro Haze1, Saba Taherpour2,3, Christoph Wolf2,3, Jaehyun Lee2,3, Yaowu Liu2,3, Andreas Heinrich2,3, Fabio Donati2,3, •Yasuo Yoshida4, and Soo-hyon Phark2,3 — 1ISSP Univ. Tokyo, Kashiwa, Japan — 2Center for Quantum Nanoscience, Seoul, Korea — 3Ewha Womans University, Seoul, Korea — 4Kanazawa Univ, Kanazawa, Japan
Correlations between s- and f-electrons are a fundamental topic in condensed matter physics, as they can give rise to exotic phases such as heavy-fermion or non-Fermi-liquid states. Recent work has shown that isolated Sm atoms adsorbed on MgO adopt a monovalent configuration with an S=1/2 spin originating from the 6s orbital, making a single Sm atom an ideal platform for studying s-f correlations at the atomic level. Here, we performed ESR-STM measurements on individual Sm atoms adsorbed on MgO films grown on an Ag(100) substrate. We find that the excitation energy varies strongly with the orientation of the external magnetic field, even though STM probes an S=1/2 spin, which is in principle free from single-ion magnetic anisotropy. The extracted g-values from the ESR measurements range from 1.3 to 6.4. This pronounced anisotropy indicates strong coupling between the s- and f-electrons within a single Sm atom, suggesting that surface-adsorbed Sm atoms may serve as promising building blocks for artificial Kondo lattices.
Keywords: scanning tunneling microscopy and spectroscopy; Electron spin resonance; Rare earth magnetism; s-f correlation