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Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in 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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Li,  Z. W.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sakong,  S.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ryu,  G.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zhao,  L.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Subakti,  S.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hu,  Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Stockert,  O.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126701

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., 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.


Cite as: http://hdl.handle.net/21.11116/0000-0004-7631-0
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.