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000865387 0247_ $$2doi$$a10.1103/PhysRevB.100.014411
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000865387 1001_ $$0P:(DE-HGF)0$$aGuo, H.$$b0
000865387 245__ $$aSuppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in La 2 − x Sr x CoO 4
000865387 260__ $$aWoodbury, NY$$bInst.$$c2019
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000865387 520__ $$aHere, we reinvestigate the underlying charge and magnetic correlations in La2−xSrxCoO4 within a combined study of muon spin relaxation (μSR), x-ray photon correlation spectroscopy, synchrotron radiation single-crystal x-ray diffraction, and neutron-scattering measurements. For La2−xSrxCoO4 around 1/3 hole-doping, the significant charge correlations that are responsible for the emergence of hour-glass magnetic spectra are found to be slowly fluctuating checkerboard charge ordering (CBCO) correlations with an onset temperature being independent of hole-doping. This reveals a local origin of the CBCO correlations in the rather ionic cobaltates, thus being distinct from the more covalent nickelates. Moreover, we report the observation of a very similar temperature dependence of the intensities of in-plane high- and low-energy excitations within the La2−xSrxCoO4 hour-glass spectrum. This observation shows that nano phase separation is distinct from conventional phase separation and that there is a coupling between nanometer-sized undoped and hole-doped islands. Based on this, it is possible to propose a microscopic scenario for the suppression of the outwards-dispersing branches in hour-glass magnetic spectra.
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000865387 7001_ $$0P:(DE-HGF)0$$aLi, Z. W.$$b1
000865387 7001_ $$0P:(DE-HGF)0$$aSakong, S.$$b2
000865387 7001_ $$0P:(DE-HGF)0$$aRyu, G.$$b3
000865387 7001_ $$0P:(DE-HGF)0$$aZhao, L.$$b4
000865387 7001_ $$0P:(DE-HGF)0$$aPiovano, A.$$b5
000865387 7001_ $$0P:(DE-Juel1)130944$$aSchmidt, W.$$b6
000865387 7001_ $$0P:(DE-HGF)0$$aSprung, M.$$b7
000865387 7001_ $$0P:(DE-HGF)0$$aStrempfer, J.$$b8
000865387 7001_ $$0P:(DE-HGF)0$$aFrancoual, S.$$b9
000865387 7001_ $$0P:(DE-HGF)0$$aDzhigaev, D.$$b10
000865387 7001_ $$0P:(DE-HGF)0$$aSubakti, S.$$b11
000865387 7001_ $$0P:(DE-HGF)0$$aHu, Z.$$b12
000865387 7001_ $$0P:(DE-HGF)0$$aLin, H. J.$$b13
000865387 7001_ $$0P:(DE-HGF)0$$aChen, C. T.$$b14
000865387 7001_ $$0P:(DE-HGF)0$$aLuetkens, H.$$b15
000865387 7001_ $$0P:(DE-HGF)0$$aStockert, O.$$b16
000865387 7001_ $$0P:(DE-HGF)0$$aKomarek, A. C.$$b17$$eCorresponding author
000865387 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.100.014411$$bAmerican Physical Society (APS)$$d2019-07-09$$n1$$p014411$$tPhysical Review B$$v100$$x2469-9950$$y2019
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