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Charge correlations in cobaltates La2-xSrxCoO4

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Guo,  H.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Komarek,  A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Guo, H., Schmidt, W., Tjeng, L. H., & Komarek, A. C. (2015). Charge correlations in cobaltates La2-xSrxCoO4. Physica Status Solidi RRL - Rapid Research Letters, 9(10), 580-582. doi:10.1002/pssr.201510290.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-02BD-3
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