First discovery of an hour-glass spectrum in oxygen doped cobaltates
For the first time we discovered an hour-glass magnetic spectrum in an oxygen-doped cobaltate. Compared to the Sr-doped cobaltates the exchange interactions are distinctly smaller in this system which enables us to study our novel nano phase separation model for an entirely different scenario (with differnt J) which will help us to obtain an understanding of hour-glass spectra. As an 'input' parameter for such a model, we need to know all structural details. However, we are already facing the problem to distinguish and to disentangle magnetic from structural (i) octahedral tilting, (ii) charge and (iii) oxygen ordering contributions. Are there charge stripe correlations together with checkerboard charge order? How many different kinds of magnetic correlations are present? In order to address these fundamental questions, we need to perform temperature dependent polarized neutron scattering experiments. The IN20 spectrometer will allow us to answer these questions. Furthermore, we will be also able to study the in-plane and out-of-plane character of the magnetic correlations at the IN20 spectrometer and to search for anomalous out-of-plane high energy excitations around 40 meV.
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KOMAREK Alexander Christoph; GUO Hanjie; WEI PENG; PIOVANO Andrea and SCHMIDT Wolfgang F. (2018). First discovery of an hour-glass spectrum in oxygen doped cobaltates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-540
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