Spin excitations in the antiferromagnetNaNiO2 | Zendy

S. de Brion | Zendy; Céline Darie | Zendy; Michael Holzapfel | Zendy; Diyar Talbayev | Zendy; L. Mihály | Zendy; Ferenc Simon | Zendy; A. Jánossy | Zendy; G. Chouteau | Zendy

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Spin excitations in the antiferromagnetNaNiO2

Author(s) -

S. de Brion,

Céline Darie,

Michael Holzapfel,

Diyar Talbayev,

L. Mihály,

Ferenc Simon,

A. Jánossy,

G. Chouteau

Publication year - 2007

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.75.094402

Subject(s) - antiferromagnetism , spins , condensed matter physics , anisotropy , physics , ion , spin (aerodynamics) , magnetic anisotropy , quantum mechanics , magnetic field , magnetization , thermodynamics

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 Atype antiferromagnet with ferro- magnetic layers weakly coupledantiferromagnetically. We studied the magnetic excitations with the electronspin resonance for frequencies 1-20 cm-1, in magnetic fields up to 14 T. Thebulk of the results are interpreted in terms of a phenomenological modelinvolving bi-axial anisotropy for the spins: a strong easy-plane term, and aweaker anisotropy within the plane. The direction of the easy plane isconstrained by the collective Jahn-Teller distortion occurring in this materialat 480 K

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