Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A24: Novel Strongly Correlated d- and f-electron Systems: Experiment and Precision Many-body Theory
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 237
Sponsoring
Unit:
DCMP
Chair: Turan Birol, University of Minnesota
Abstract: A24.00002 : Unveiling charge, spin, and orbital excitations in correlated d-electron materials by resonant inelastic x-ray scattering
8:36 AM–9:12 AM
Presenter:
Matthias Hepting
(Max Planck Institute for Solid State Physics, FRG)
Author:
Matthias Hepting
(Max Planck Institute for Solid State Physics, FRG)
Recently, we have performed O K-edge RIXS experiments on the correlated 4d-electron metal Sr2RhO4, which revealed a spin-orbit entangled collective excitation [1]. The dispersion relation of this mode is opposite to that of the 5d antiferromagnetic Mott insulator Sr2IrO4, where the spin-orbit excitons are dressed by magnons. We find that a tight-binding model accounting for the different ground states of the materials accurately captures the distinct dispersions. The presence of propagating spin-orbit excitons in Sr2RhO4 implies that spin-orbit coupling in the material is unquenched, and that collective instabilities in correlated 4d metals must be described in terms of spin-orbit entangled electronic states.
In most 3d-electron materials, spin-orbit coupling plays only a minor role, whereas their electronic and magnetic structures are predominantly shaped by strong electron-electron correlations, as for instance in the case of cuprate superconductors. Remarkably, the newly discovered rare-earth nickelate superconductors exhibit several formal analogies to cuprate superconductors. Yet, using x-ray absorption spectroscopy (XAS) and RIXS at the O K- and Ni L-edge, we observe that the cuprate-typical 3d-2p hybridization between the transition metal ion and oxygen is diminished in nickelates, while the rare-earth 5d electrons contribute to their low-energy electronic structure [2]. Furthermore, a combination of muon-spin rotation (μSR) spectroscopy and thermodynamic properties measurements indicate a profound analogy between the magnetic correlations in parent (undoped) nickelates and doped cuprates [3].
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2025 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700