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Spin fluctuations in Sr1.8La0.2RuO4

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Title
Spin fluctuations in Sr1.8La0.2RuO4
Author(s)
He, Z.; Wang, Q.; Feng, Y.; Kim, C.; Wonshik Kyung; Changyoung Kim; Wo, H.; Ding, G.; Hao, Y.; Liu, F.; Walker, H.C.; Adroja, D.T.; Schneidewind, A.; Wang, W.; Zhao, J.
Publication Date
2023-05
Journal
Physical Review B, v.107, no.20
Publisher
American Physical Society
Abstract
We use inelastic neutron scattering to study spin fluctuations in Sr1.8La0.2RuO4, where Lanthanum doping triggers a Lifshitz transition by pushing the van Hove singularity in the γ band to the Fermi energy. Strong spin fluctuations emerge at an incommensurate wave vector Qic=(0.3,0.3), corresponding to the nesting vector between α and β Fermi sheets. The incommensurate antiferromagnetic fluctuations shift toward (0.25,0.25) with increasing energy up to ∼110 meV. By contrast, scatterings near the ferromagnetic wave vectors Q=(1,0) and (1,1) remain featureless at all energies. This contradicts the weak-coupling perspective that suggests a sharp enhancement of ferromagnetic susceptibility due to the divergence of density of states in the associated γ band. Our findings imply that ferromagnetic fluctuations in Sr2RuO4 and related materials do not fit into the weak-coupling paradigm, but instead are quasilocal fluctuations induced by Hund's coupling. This imposes significant constraints for the pairing mechanism involving spin fluctuations. © 2023 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/13441
DOI
10.1103/PhysRevB.107.L201107
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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