SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 25: Poster Session II: Surface magnetism II
O 25.5: Poster
Montag, 1. März 2021, 13:30–15:30, P
Probing the magnetism of single atoms with orbital sensitivity — Aparajita Singha1,2, •Daria Sostina1,2, Christoph Wolf1,2, Safa Ahmed1,3, Denis Krylov1,2, Luciano Colazzo1,2, Pierluigi Gargiani4, Stefano Agrestini4, Woo-Suk Noh5, Jae-Hoon Park5,6, Marina Pivetta7, Stefano Rusponi7, Harald Brune7, Andreas Heinrich1,3, Alessandro Barla8, and Fabio Donati1,3 — 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul, Republic of Korea — 2Ewha Womans University, Seoul, Republic of Korea — 3Department of Physics, Ewha Womans University, Seoul, Republic of Korea — 4ALBA Synchrotron Light Source, Cerdanyola del Vallès, Catalonia, Spain — 5MPPC-CPM, Max Planck POSTECH/Korea Research Initiative, Pohang, Korea — 6Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, Korea — 7Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland — 8Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), Trieste, Italy
Lanthanide atoms are promising candidates for atomic data storage and quantum logic due to the long magnetic lifetime.[Science 352, 318 (2016)]. Here, we use the orbital sensitivity of x-ray absorption spectroscopy to investigate the valence magnetism of rare earth atoms and clusters on MgO/Ag(100). We find both Gd and Ho atoms in a monovalent state, with one electron transferred to the underneath substrate. Combining our experiments with multiplet calculations and density functional theory we clarify the controversy on the ground state of Ho single atom magnets [Phys. Rev. Lett. 121, 027201 (2018)].