Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4

2016 | journal article. A publication with affiliation to the University of Göttingen.

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​Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4​
Li, Z. W.; Drees, Y.; Kuo, C. Y.; Guo, H.; Ricci, A.; Lamago, D. & Sobolev, O. et al.​ (2016) 
Scientific Reports6 art. 25117​.​ DOI: https://doi.org/10.1038/srep25117 

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Authors
Li, Z. W.; Drees, Y.; Kuo, C. Y.; Guo, H.; Ricci, A.; Lamago, D.; Sobolev, Oleg; Ruett, Uta; Gutowski, Olof; Pi, T. W.; Piovano, A.; Schmidt, W.; Mogare, K.; Hu, Z.; Tjeng, L. H.; Komarek, A. C.
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.
Issue Date
2016
Status
published
Publisher
Nature Publishing Group
Journal
Scientific Reports 
ISSN
2045-2322

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