Hauptseite > Publikationsdatenbank > Incommensurate spin correlations in highly oxidized cobaltates La$_{2−x}$Sr$_{x}$CoO$_{4}$ > print

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100 1 _ |a Li, Z. W.
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245 _ _ |a Incommensurate spin correlations in highly oxidized cobaltates La$_{2−x}$Sr$_{x}$CoO$_{4}$
260 _ _ |a London
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520 _ _ |a We 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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