Magnetic excitations in oxygen doped cobaltates
Recently, we were able to develop a new explanation for the emergence of hour-glass magentic spectra in cobalt oxides. In our nano phase separation scenario, the hour-glass dispersion arises from strongly decoupled excitations within undoped and hole-rich regions of nanometer size. Whereas Co ions within the nanometer-sized hole-rich regions are coupled with weak exchange interactions J', the Co ions within the nanoscopic undoped islands are coupled with stronger exchange interactions J. In order to distinguish between two possible sub-scenarios of our nano phase separation model, we started to study oxygen-doped cobaltates. Compared to La2-xSrxCoO4 distinctly smaller exchange interactions J' appear in the La2CoO4+delta system which is a promising property. Our main goal is to find out whether the crossing of the hour-glass spectrum originates from an in-plane anisotropy gap within the undoped islands or from a crossing of dispersions. Due to the smaller exchange interactions in oxygen doped cobaltates this difference will become apparent in the magnetic excitation spectra which will enable us to answer this fundamental question of the origin of hour-glass spectra.
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KOMAREK Alexander Christoph; GUO Hanjie and PIOVANO Andrea. (2018). Magnetic excitations in oxygen doped cobaltates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-491
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