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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., et al. (2016). Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4. Scientific Reports, 6: 25117, pp. 1-8. doi:10.1038/srep25117.

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 Creators:
Li, Z. W.1, Author           
Drees, Y.1, Author           
Kuo, C. Y.1, Author           
Guo, H.1, Author           
Ricci, A.2, Author
Lamago, D.2, Author
Sobolev, O.2, Author
Ruett, U.2, Author
Gutowski, O.2, Author
Pi, T. W.2, Author
Piovano, A.2, Author
Schmidt, W.2, Author
Mogare, K.3, Author           
Hu, Z.4, Author           
Tjeng, L. H.5, Author           
Komarek, A. C.6, Author           
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              
3Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
4Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
5Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
6Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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 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.

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Language(s): eng - English
 Dates: 2016-04-272016-04-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000374858800002
DOI: 10.1038/srep25117
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 25117 Start / End Page: 1 - 8 Identifier: Other: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322