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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.$$c2023
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001007492 520__ $$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.
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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. L201107$$n20$$pL201107$$tPhysical review / B$$v107$$x2469-9950$$y2023
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