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@ARTICLE{He:1007492,
author = {He, Zheng and Wang, Qisi and Feng, Yu and Kim, Chul and
Kyung, Wonshik and Kim, Changyoung and Wo, Hongliang and
Ding, Gaofeng and Hao, Yiqing and Liu, Feiyang and Walker,
Helen C. and Adroja, Devashibhai T. and Schneidewind, Astrid
and Wang, Wenbin and Zhao, Jun},
title = {{S}pin fluctuations in {S}r 1.8 {L}a 0.2 {R}u{O} 4},
journal = {Physical review / B},
volume = {107},
number = {20},
issn = {2469-9950},
address = {Woodbury, NY},
publisher = {Inst.},
reportid = {FZJ-2023-02082},
pages = {L201107},
year = {2023},
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
spinfluctuations 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 sharpenhancement
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 weakcoupling paradigm, but
instead are quasilocal fluctuations induced by Hund’s
coupling. This imposes significant constraints for the
pairing mechanism involving spin fluctuations.},
cin = {JCNS-FRM-II / MLZ / JCNS-2 / JCNS-4},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-4-20201012},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
(POF4-6G4) / 632 - Materials – Quantum, Complex and
Functional Materials (POF4-632)},
pid = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
experiment = {EXP:(DE-MLZ)PANDA-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000993596700003},
doi = {10.1103/PhysRevB.107.L201107},
url = {https://juser.fz-juelich.de/record/1007492},
}