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  Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in La2-xSrxCoO4

Guo, H., Li, Z. W., Sakong, S., Ryu, G., Zhao, L., Piovano, A., et al. (2019). Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in La2-xSrxCoO4. Physical Review B, 100(1): 014411, pp. 1-12. doi:10.1103/PhysRevB.100.014411.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-7631-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7637-A
Genre: Journal Article

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 Creators:
Guo, H.1, Author              
Li, Z. W.1, Author              
Sakong, S.1, Author              
Ryu, G.1, Author              
Zhao, L.1, Author              
Piovano, A.2, Author
Schmidt, W.2, Author
Sprung, M.2, Author
Strempfer, J.2, Author
Francoual, S.2, Author
Dzhigaev, D.2, Author
Subakti, S.1, Author              
Hu, Z.3, Author              
Lin, H. J.2, Author
Chen, C. T.2, Author
Luetkens, H.2, Author
Stockert, O.1, Author              
Komarek, A. C.4, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
4Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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 Abstract: Here, we reinvestigate the underlying charge and magnetic correlations in La2-xSrxCoO4 within a combined study of muon spin relaxation (mu SR), x-ray photon correlation spectroscopy, synchrotron radiation single-crystal x-ray diffraction, and neutron-scattering measurements. For La2-xSrxCoO4 around 1/3 hole-doping, the significant charge correlations that are responsible for the emergence of hour-glass magnetic spectra are found to be slowly fluctuating checkerboard charge ordering (CBCO) correlations with an onset temperature being independent of hole-doping. This reveals a local origin of the CBCO correlations in the rather ionic cobaltates, thus being distinct from the more covalent nickelates. Moreover, we report the observation of a very similar temperature dependence of the intensities of in-plane high-and low-energy excitations within the La2-xSrxCoO4 hour-glass spectrum. This observation shows that nano phase separation is distinct from conventional phase separation and that there is a coupling between nanometer-sized undoped and hole-doped islands. Based on this, it is possible to propose a microscopic scenario for the suppression of the outwards-dispersing branches in hour-glass magnetic spectra.

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Language(s): eng - English
 Dates: 2019-07-092019-07-09
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 100 (1) Sequence Number: 014411 Start / End Page: 1 - 12 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008