Charge correlations and Phase Diagram of La2CoO4+d
Recently, we were able to develop a new explanation for the emergence of hour-glass magentic spectra in cobalt oxides and to discard an alternative charge stripe scenario. In our nano phase separation scenario, the hour-glass dispersion arises from strongly decoupled excitations within undoped and hole-rich checkerboard charge ordered regions of nanometer size. Besides the Sr-doped cobaltates La2-xSrxCoO4 we also started studying the oxygen doped counterpart La2CoO4+d now in order to test our nano phase separation scenario for a different system. Indeed, the exchange couplings are strongly reduced in the oxygen doped cobaltates. Surprisingly the magnetic excitations are also different from the ones in La2-xSrxCoO4. Therefore, La2CoO4+d is an important system to get further insight in our nanophase separation scenario with very different input parameters. So far, nothing is known about the charge correlations in La2CoO4+d, which is an important part (input parameter) of our nano phase separation scenario. Therefore, we propose to study the unknown La2CoO4+d phase diagram in detail now, especially with focus on the charge correlations.
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KOMAREK Alexander Christoph; GUO Hanjie; PIOVANO Andrea and ZHAO Li. (2017). Charge correlations and Phase Diagram of La2CoO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-15-614
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