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Journal Article

Spin excitations in the antiferromagnet NaNiO2

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de Brion,  S.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Holzapfel,  M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Chouteau,  G.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

de Brion, S., Darie, C., Holzapfel, M., Talbayev, D., Mihaly, L., Simon, F., et al. (2007). Spin excitations in the antiferromagnet NaNiO2. Physical Review B, 75(9): 094402.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B570-7
Abstract
In NaNiO2, Ni3+ ions form a quasi-two-dimensional triangular lattice of S=1/2 spins. The magnetic order observed below 20 K has been described as an A type antiferromagnet with ferromagnetic layers weakly coupled antiferromagnetically. We studied the magnetic excitations with the electron spin resonance for frequencies 1-20 cm(-1), in magnetic fields up to 14 T. The bulk of the results are interpreted in terms of a phenomenological model involving biaxial anisotropy for the spins: a strong easy-plane term, and a weaker anisotropy within the plane.