Spin correlations in RNiO3 (R=La)
Until now single crystal neutron diffraction and spectroscopy of the intriguing rare earth nickelate materials were hampered due to the lack of sizeable single crystals. By using high pressure floating zone mirror furnaces at oxygen pressures above 150 bar we were able to grow large nickelate single crystals for the first time. Neither impurity phases nor other crystallites are visible within Laue diffraction, powder and single crystal X-ray diffraction measurements of these high quality single crystals. Synchrotron radiation X-ray absorbtion spectroscopy measurements confirm that our samples are stoichiometric and contain neither additional Ni2+ nor Ni4+ ions. Here, we propose to study the spin correlations of these fascinating materials in detail on our novel single crystals. Especially we would like to re-analyze the magnetism in the metallic state of LaNiO3 which exhibits weak magnetic anomalies at transition temperatures similar to that of the insulating nickelate materials within our magnetization measurements on oriented single crystals. For all these purposes we ask for 4 days at the IN12 cold triple-axis spectrometer.
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KOMAREK Alexander Christoph; GUO Hanjie; LI Zhiwei and SCHMIDT Wolfgang F. (2015). Spin correlations in RNiO3 (R=La). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1418
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