Spin excitations in the antiferromagnet NaNiO2

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 r...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2007-03, Vol.75
Main Authors: de Brion, Sophie, Darie, Céline, Hopzapfel, M., Talbayev, D., Mihaly, L., Simon, F., Janossy, A., Chouteau, G.
Format: Article
Language:English
Subjects:
Condensed Matter
Physics
Strongly Correlated Electrons
Online Access:Get full text
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Summary: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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.75.094402