High-temperature study of charge correlations in layered cobalt oxides
The observation of hour-glass magnetic spectra in layered Cobalt oxides La2-xSrxCoO4 which are isostructural to the prototypical HTSC cuprate materials La2-xSrxCuO4 attracted enormous attention. Due to the missing knowledge about the nature of charge ordering within the La2-xSrxCoO4 phase diagram it was difficult to understand the true origin of the hour-glass spectra in these cobaltates in the past. Within the entire La2-xSrxCoO4 phase diagram there is not a single known point of any charge correlations (including charge ordering onset temperatures) apart from the half-doped sample. In order to change this situation, we would like to study the charge correlations systematically as a function of hole-doping and temperature for x=1/3, 0.4, 2/3 and 0.8. A thermal triple-axis spectrometer turns out to be essential for measuring weak superstructure reflections not only in cuprates but also in these cobaltates. Especially away from half-doping the situation will worsen drastically since the already weak reflections get continuously broader and weaker away from x=1/2. For all these purposes, we ask for 6 days at the IN8 spectrometer.
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KOMAREK Alexander Christoph; GUO Hanjie; LI Zhiwei; PIOVANO Andrea and SCHMIDT Wolfgang F. (2015). High-temperature study of charge correlations in layered cobalt oxides. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-11-412
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