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Distinct spin and orbital dynamics in Sr 2 RuO 4 .

Authors :
Suzuki H
Wang L
Bertinshaw J
Strand HUR
Käser S
Krautloher M
Yang Z
Wentzell N
Parcollet O
Jerzembeck F
Kikugawa N
Mackenzie AP
Georges A
Hansmann P
Gretarsson H
Keimer B
Source :
Nature communications [Nat Commun] 2023 Nov 03; Vol. 14 (1), pp. 7042. Date of Electronic Publication: 2023 Nov 03.
Publication Year :
2023

Abstract

The unconventional superconductor Sr <subscript>2</subscript> RuO <subscript>4</subscript> has long served as a benchmark for theories of correlated-electron materials. The determination of the superconducting pairing mechanism requires detailed experimental information on collective bosonic excitations as potential mediators of Cooper pairing. We have used Ru L <subscript>3</subscript> -edge resonant inelastic x-ray scattering to obtain comprehensive maps of the electronic excitations of Sr <subscript>2</subscript> RuO <subscript>4</subscript> over the entire Brillouin zone. We observe multiple branches of dispersive spin and orbital excitations associated with distinctly different energy scales. The spin and orbital dynamical response functions calculated within the dynamical mean-field theory are in excellent agreement with the experimental data. Our results highlight the Hund metal nature of Sr <subscript>2</subscript> RuO <subscript>4</subscript> and provide key information for the understanding of its unconventional superconductivity.<br /> (© 2023. The Author(s).)

Details

Language :
English
ISSN :
2041-1723
Volume :
14
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
37923750
Full Text :
https://doi.org/10.1038/s41467-023-42804-3