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Abstract:
We report on an elastic neutron scattering study of the charge
correlations in La2-xSrxCoO4 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-xSrxCoO4. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
