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Spin excitations in the antiferromagnet NaNiO2

Authors
  • De Brion, Sophie
  • Darie, C.
  • Hopzapfel, M.
  • Talbayev, D.
  • Mihaly, L.
  • Simon, F.
  • Janossy, A.
  • Chouteau, G.
Type
Published Article
Publication Date
Aug 10, 2006
Submission Date
Aug 10, 2006
Identifiers
DOI: 10.1103/PhysRevB.75.094402
arXiv ID: cond-mat/0608238
Source
arXiv
License
Unknown
External links

Abstract

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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