Comparison of electron phonon coupling in cobaltates and nickelates
The discovery of an hour-glass shaped magnetic excitation spectrum in copper-free cobalt oxides has triggered enormous research activity. Very recently, we started studying the impact of electron phonon coupling in these materials. In a direct comparative study of a nickelate and cobaltate material with same Sr-concentration x, we observed a very opposing behaviour of the high-frequency metal-oxygen bond-stretching phonon dispersions in both materials. We attribute this opposing behaviour to the differnt charge correlations in these materials which was quite surprising since diagonal charge stripe correlations were expected for both materials. For further insight in electron phonon coupling in these interesting materails we propose to start a systematic study, where we always compare the topmost Sigma_1 bond-stretching phonon dispersion of a cobaltate and a nickelate reference material with same hole-concentration x similar as we have done in the past for x=0.4. Additionally, we would also like to study the temperature dependence of these bond-stretching phonon modes, if time would be left. For all these purposes we ask for 6 days at the IN8 spectrometer.
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KOMAREK Alexander Christoph; GUO Hanjie; LI Zhiwei and PIOVANO Andrea. (2015). Comparison of electron phonon coupling in cobaltates and nickelates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-421
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