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@ARTICLE{Guo:281111,
      author       = {Guo, H. and Schmidt, W. and Tjeng, L. H. and Komarek, A.
                      C.},
      title        = {{C}harge correlations in cobaltates {L}a 2- x {S}r x
                      {C}o{O} 4},
      journal      = {Physica status solidi / Rapid research letters},
      volume       = {9},
      number       = {10},
      issn         = {1862-6254},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2016-00816},
      pages        = {580 - 582},
      year         = {2015},
      abstract     = {Nano-phase separation in La2–xSrx CoO4 (schematically).
                      Red areas: undoped La2CoO4 islands, blue areas: checkerboard
                      charge ordered regions; black, green and blue balls
                      represent nonmagnetic Co3+ ions, magnetic Co2+ ions and
                      oxygen ions, respectively; green arrows indicate Co2+ spins
                      [1, 2].We report on an elastic neutron scattering study of
                      the charge correlations in La2–xSrx CoO4 with x = 1/3, 0.4
                      and 0.5. We found that the checkerboard charge ordering
                      correlations present in the x = 0.5 sample persist in the x
                      = 0.4 and 1/3 materials. These checkerboard charge ordering
                      correlations are robust and explain the occurrence of
                      nano-phase separation in layered cobaltates for
                      Sr-concentrations away from half-doping. The half-integer
                      reflections then arise from the nanometer-sized hole-rich
                      regions (blue areas in title figure) instead of the undoped
                      ones (red areas in title figure). The appearance of
                      nano-phase separation is an important ingredient for
                      understanding the formation of hour-glass shaped magnetic
                      excitation spectra in La2–xSrx CoO4.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-ILL},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000363266800005},
      doi          = {10.1002/pssr.201510290},
      url          = {https://juser.fz-juelich.de/record/281111},
}