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Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4

MPS-Authors
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Li,  Z. W.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Drees,  Y.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kuo,  C. Y.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Guo,  H.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mogare,  K.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hu,  Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Komarek,  A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Li, Z. W., Drees, Y., Kuo, C. Y., Guo, H., Ricci, A., Lamago, D., et al. (2016). Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4. Scientific Reports, 6: 25117, pp. 1-8. doi:10.1038/srep25117.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-C5D4-D
Abstract
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.