Study of the temperature dependence of the hour-glass dispersion in cobaltates
The discovery of charge stripe ordering in nickelate and cuprate systems has triggered a lot of research activity due to the possible relevance of charge stripes for the pairing mechanism in the HTSC cuprates. Recently, an hour-glass magnetic spectrum resembling on the famous excitations in the cuprates has been found in La5/3Sr1/3CoO4. This observation was believed to corroborate the connection between hour-glass-shaped magnetic excitation spectra and charge stripes (either static or dynamic). In contrast to that we were able to show that charge stripes play no crucial role for the emergence of the hour-glass dispersion in the cobaltates. Instead, frustration seems to be the key feature that triggers the onset of the hour-glass spectra in these materials. In our recent study the temperature dependence of these hour-glass spectra was missing. Exactly this temperature dependence could give important information for our spin wave simulations and help us to understand the detailed mechanism of the hour-glass dispersion. Therefore, we propose to measure the missing temperature dependence of the hour-glass dispersion in our La1.6Sr0.4CoO4 high quality single crystals.
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KOMAREK Alexander Christoph; DREES Jan Yvo; GUO Hanjie; LI Zhiwei and PIOVANO Andrea. (2014). Study of the temperature dependence of the hour-glass dispersion in cobaltates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1368
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