001007492 001__ 1007492 001007492 005__ 20231027114405.0 001007492 0247_ $$2doi$$a10.1103/PhysRevB.107.L201107 001007492 0247_ $$2ISSN$$a2469-9950 001007492 0247_ $$2ISSN$$a2469-9977 001007492 0247_ $$2ISSN$$a0163-1829 001007492 0247_ $$2ISSN$$a0556-2805 001007492 0247_ $$2ISSN$$a1095-3795 001007492 0247_ $$2ISSN$$a1098-0121 001007492 0247_ $$2ISSN$$a1538-4489 001007492 0247_ $$2ISSN$$a1550-235X 001007492 0247_ $$2ISSN$$a2469-9969 001007492 0247_ $$2Handle$$a2128/34508 001007492 0247_ $$2WOS$$aWOS:000993596700003 001007492 037__ $$aFZJ-2023-02082 001007492 082__ $$a530 001007492 1001_ $$0P:(DE-HGF)0$$aHe, Zheng$$b0 001007492 245__ $$aSpin fluctuations in Sr 1.8 La 0.2 RuO 4 001007492 260__ $$aWoodbury, NY$$bInst.$$c2023 001007492 3367_ $$2DRIVER$$aarticle 001007492 3367_ $$2DataCite$$aOutput Types/Journal article 001007492 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1698057212_14715 001007492 3367_ $$2BibTeX$$aARTICLE 001007492 3367_ $$2ORCID$$aJOURNAL_ARTICLE 001007492 3367_ $$00$$2EndNote$$aJournal Article 001007492 520__ $$aWe use inelastic neutron scattering to study spin fluctuations in Sr1.8La0.2RuO4, where Lanthanum doping triggers a Lifshitz transition by pushing the van Hove singularity in the γ band to the Fermi energy. Strong spinfluctuations emerge at an incommensurate wave vector Qic = (0.3, 0.3), corresponding to the nesting vector between α and β Fermi sheets. The incommensurate antiferromagnetic fluctuations shift toward (0.25,0.25) with increasing energy up to ∼110 meV. By contrast, scatterings near the ferromagnetic wave vectors Q = (1, 0) and (1,1) remain featureless at all energies. This contradicts the weak-coupling perspective that suggests a sharpenhancement of ferromagnetic susceptibility due to the divergence of density of states in the associated γ band. Our findings imply that ferromagnetic fluctuations in Sr2RuO4 and related materials do not fit into the weakcoupling paradigm, but instead are quasilocal fluctuations induced by Hund’s coupling. This imposes significant constraints for the pairing mechanism involving spin fluctuations. 001007492 536__ $$0G:(DE-HGF)POF4-6G4$$a6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4)$$cPOF4-6G4$$fPOF IV$$x0 001007492 536__ $$0G:(DE-HGF)POF4-632$$a632 - Materials – Quantum, Complex and Functional Materials (POF4-632)$$cPOF4-632$$fPOF IV$$x1 001007492 588__ $$aDataset connected to CrossRef, Journals: juser.fz-juelich.de 001007492 65027 $$0V:(DE-MLZ)SciArea-120$$2V:(DE-HGF)$$aCondensed Matter Physics$$x0 001007492 65027 $$0V:(DE-MLZ)SciArea-170$$2V:(DE-HGF)$$aMagnetism$$x1 001007492 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0 001007492 693__ $$0EXP:(DE-MLZ)PANDA-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)PANDA-20140101$$6EXP:(DE-MLZ)SR2-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$ePANDA: Cold three axes spectrometer$$fSR2$$x0 001007492 7001_ $$00000-0002-8741-7559$$aWang, Qisi$$b1$$eCorresponding author 001007492 7001_ $$0P:(DE-HGF)0$$aFeng, Yu$$b2 001007492 7001_ $$0P:(DE-HGF)0$$aKim, Chul$$b3 001007492 7001_ $$00000-0001-8750-5471$$aKyung, Wonshik$$b4 001007492 7001_ $$0P:(DE-HGF)0$$aKim, Changyoung$$b5 001007492 7001_ $$00000-0002-0391-7899$$aWo, Hongliang$$b6 001007492 7001_ $$0P:(DE-HGF)0$$aDing, Gaofeng$$b7 001007492 7001_ $$0P:(DE-HGF)0$$aHao, Yiqing$$b8 001007492 7001_ $$0P:(DE-HGF)0$$aLiu, Feiyang$$b9 001007492 7001_ $$00000-0002-7859-5388$$aWalker, Helen C.$$b10 001007492 7001_ $$00000-0003-2280-079X$$aAdroja, Devashibhai T.$$b11 001007492 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, Astrid$$b12 001007492 7001_ $$0P:(DE-HGF)0$$aWang, Wenbin$$b13 001007492 7001_ $$aZhao, Jun$$b14$$eCorresponding author 001007492 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.107.L201107$$gVol. 107, no. 20, p. 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