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000809921 1001_ $$0P:(DE-HGF)0$$aLi, Z. W.$$b0
000809921 245__ $$aIncommensurate spin correlations in highly oxidized cobaltates La$_{2−x}$Sr$_{x}$CoO$_{4}$
000809921 260__ $$aLondon$$bNature Publishing Group$$c2016
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000809921 520__ $$aWe observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La2−xSrxCoO4 with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitations in this highly hole-doped incommensurate regime and compare our results with those found in the low-doped incommensurate regime that exhibit hourglass magnetic spectra. The hourglass shape of magnetic excitations completely disappears given a high Sr doping. Moreover, broad low-energy excitations are found, which are not centered at the incommensurate magnetic peak positions but around the quarter-integer values that are typically exhibited by excitations in the checkerboard charge ordered phase. Our findings suggest that the strong inter-site exchange interactions in the undoped islands are critical for the emergence of hourglass spectra in the incommensurate magnetic phases of La2−xSrxCoO4.
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000809921 7001_ $$0P:(DE-HGF)0$$aDrees, Y.$$b1
000809921 7001_ $$0P:(DE-HGF)0$$aKuo, C. Y.$$b2
000809921 7001_ $$0P:(DE-HGF)0$$aGuo, H.$$b3
000809921 7001_ $$0P:(DE-HGF)0$$aRicci, A.$$b4
000809921 7001_ $$0P:(DE-HGF)0$$aLamago, D.$$b5
000809921 7001_ $$0P:(DE-HGF)0$$aSobolev, O.$$b6
000809921 7001_ $$0P:(DE-HGF)0$$aRütt, U.$$b7
000809921 7001_ $$0P:(DE-HGF)0$$aGutowski, O.$$b8
000809921 7001_ $$0P:(DE-HGF)0$$aPi, T. W.$$b9
000809921 7001_ $$0P:(DE-HGF)0$$aPiovano, A.$$b10
000809921 7001_ $$0P:(DE-Juel1)130944$$aSchmidt, W.$$b11
000809921 7001_ $$0P:(DE-HGF)0$$aMogare, K.$$b12
000809921 7001_ $$0P:(DE-HGF)0$$aHu, Z.$$b13
000809921 7001_ $$0P:(DE-HGF)0$$aTjeng, L. H.$$b14
000809921 7001_ $$0P:(DE-HGF)0$$aKomarek, A. C.$$b15$$eCorresponding author
000809921 773__ $$0PERI:(DE-600)2615211-3$$a10.1038/srep25117$$gVol. 6, p. 25117 -$$p25117 -$$tScientific reports$$v6$$x2045-2322$$y2016
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