Spin excitations in the antiferromagnet NaNiO2

Sophie De Brion; C. Darie; M. Hopzapfel; D. Talbayev; L. Mihaly; F. Simon; A. Janossy; G. Chouteau

doi:10.1103/PhysRevB.75.094402

Spin excitations in the antiferromagnet NaNiO2

Strongly Correlated Electrons 2009-11-11 v1

Authors: Sophie De Brion , C. Darie , M. Hopzapfel , D. Talbayev , L. Mihaly , F. Simon , A. Janossy , G. Chouteau

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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.

Keywords

spin excitations antiferromagnet NaNiO2 electron spin resonance triangular lattice Jahn-Teller distortion

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@article{arxiv.cond-mat/0608238,
  title  = {Spin excitations in the antiferromagnet NaNiO2},
  author = {Sophie De Brion and C. Darie and M. Hopzapfel and D. Talbayev and L. Mihaly and F. Simon and A. Janossy and G. Chouteau},
  journal= {arXiv preprint arXiv:cond-mat/0608238},
  year   = {2009}
}

Spin excitations in the antiferromagnet NaNiO2

Abstract

Keywords

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