Polarization analysis of hour-glass-shaped magnetic excitations in La2-xSrxCoO4
The recent discovery of an hour-glass shaped magnetic excitation spectrum in insulating layered cobaltates has shown that Fermi surface effects are not needed for the emergence of hour-glass spectra. Very recently, we were able to go one step further and show that, in addition, also charge stripes are not needed for the observation of hour-glass spectra (i.e. in these cobaltates). Instead, we proposed a different scenario entirely based on frustration. Our spin wave simulations support this interpretation. Moreover, our spin wave simulations predict a different polarization dependence for certain well-separated excitations within the hour-glass dispersion. We were able to verify our predictions in a first test measurement on our cobaltates with polarized neutrons at the IN22 spectrometer. Here, we propose to study the entire hour-glass magnetic excitation spectrum of our cobaltate with polarized neutrons up to highest energies. We will provide an extremely large sample mass of 50 g in total by co-aligning several huge high-quality single crystals in order to guarantee the success of this proposed experiment. For these purposes we ask for 6 days at the IN20 spectrometer
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KOMAREK Alexander Christoph; DREES Jan Yvo; GUO Hanjie; LI Zhiwei; PIOVANO Andrea; SCHMIDT Wolfgang F and SEVERING Andrea. (2015). Polarization analysis of hour-glass-shaped magnetic excitations in La2-xSrxCoO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1422
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