Abstract:
Magnetisation measurements up to 23 T and submillimeter wave ESR in the frequency region 48-380 GHz have been performed on NaNiO2 powders at low temperature. Also typical spectra above the Néel temperature are shown. At 4 K the magnetisation shows a spin-flop transition at 1.8 T and saturation at 10 T. /Ni confirms the low spin state of the Ni3+ ions. The susceptibility exhibits a maximum at K with and K. NaNiO2 is an A-type antiferromagnet: we derive K and K for the interactions between Ni ions within and between adjacent layers, respectively. The AFMR spectra yield an energy gap of 52.5 GHz, in agreement with the spin-flop value derived from the magnetisation. The anisotropy of the g factor observed at 100 K with can be attributed to the Jahn-Teller effect for Ni3+ ions in the low spin state, which stabilises the occupation. We finally comment on the isomorphic controversial Li1-xNi1+xO2 compound.
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Received 9 March 2000 and Received in final form 13 July 2000.
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Chappel, E., Núñez-Regueiro, M., Dupont, F. et al. Antiferromagnetic resonance and high magnetic field properties of NaNiO2 . Eur. Phys. J. B 17, 609–614 (2000). https://doi.org/10.1007/s100510070098
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DOI: https://doi.org/10.1007/s100510070098