Spin excitations in the antiferromagnet NaNiO2

被引：10
|
作者：
de Brion, S.
Darie, C.
Holzapfel, M.
Talbayev, D.
Mihaly, L.
Simon, F.
Janossy, A.
Chouteau, G.
机构：
[1] CNRS, Grenoble High Magnet Field Lab, F-38042 Grenoble, France
[2] CNRS, Cristallog Lab, F-38042 Grenoble, France
[3] SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA
[4] Hungarian Acad Sci, Electron Transport Res Grp, Budapest, Hungary
[5] Budapest Univ Technol & Econ, Dept Phys, H-1111 Budapest, Hungary
[6] Budapest Univ Technol & Econ, Inst Phys & Solids, Magnet Fields Res Grp, Hungarian Acad Sci, H-1521 Budapest, Hungary
来源：
PHYSICAL REVIEW B | 2007年 / 75卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.75.094402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In NaNiO2, Ni3+ ions form a quasi-two-dimensional triangular lattice of S=1/2 spins. The magnetic order observed below 20 K has been described as an A type antiferromagnet with ferromagnetic 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 biaxial anisotropy for the spins: a strong easy-plane term, and a weaker anisotropy within the plane.
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页数：10
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