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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

Spin excitations in the antiferromagnet NaNiO2

Résumé

In NaNiO2 , Ni3+ ions form a quasi two dimensional triangular lattice of S = 1=2 spins. The magnetic order observed below 20K has been described as an A type antiferromagnet with ferro- magnetic 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 bi-axial anisotropy for the spins: a strong easy-plane term, and a weaker anisotropy within the plane. The direction of the easy plane is constrained by the collective Jahn-Teller distortion occurring in this material at 480 K.
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Dates et versions

hal-00089093 , version 1 (09-08-2006)

Identifiants

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Sophie de Brion, Céline Darie, M. Hopzapfel, D. Talbayev, L. Mihaly, et al.. Spin excitations in the antiferromagnet NaNiO2. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 75, pp.094402. ⟨10.1103/PhysRevB.75.094402⟩. ⟨hal-00089093⟩
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