Charge correlations in cobaltates with hour-glass spectra
Cobaltates have attracted enormous attention due to the occurence of hour-glass magnetic spectra in these systems. The origin of these spectra is highly discussed until now. Initially 100% charge stripe phases were expected to occur in these materials. Then, it was shown that only checkerboard charge order can be found. Very recently, it was guessed that 50% charge stripe and 50% checkerboard charge correlations appear. Now, we found that the fraction of charge stripes has to be by far much lower than 50%, if existent at all. However, the important question arises, whether even fractions of charge stripe phases are needed for hour-glass spectra or not. This was recently claimed. In order to answer this fundamental question about the origin of the famous hour-glass spectra we need to measure the fractions of all occuring phases accurately now. Hour-glass spectra of different shape were observed for x=0.25, 1/3 and 0.4 in the past. Hence, we need to measure the charge correlations in all of these materials in order to miss no system with charge stripe correlations and in order to derive conclusions from the hole-doping dependence in a systematic way.
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KOMAREK Alexander Christoph; GUO Hanjie and PIOVANO Andrea. (2018). Charge correlations in cobaltates with hour-glass spectra. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-949
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