Spin excitations in the antiferromagnet NaNiO2

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.

References in corpus (8)

• Triangular Antiferromagnets
• Quasi two-dimensional antiferromagnet on a triangular lattice RbFe(MoO4)2
• Orbital ordering in frustrated Jahn-Teller systems
• Orbital degeneracy as a source of frustration in LiNiO${}_2$
• Orbital frustration at the origin of the magnetic behavior in LiNiO2
• Orbital and spin physics in LiNiO2 and NaNiO2
• Interlayer Magnetic Frustration in Quasi-stoichiometric Li1-xNi1+xO2
• Ordering and Spin Waves in NaNiO2 : A Stacked Quantum Ferromagnet

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• Spin resonance in EuTiO3 probed by time-domain GHz ellipsometry
• Effect of magnesium doping on the orbital and magnetic order in LiNiO2
• Magnetic phase diagram of the S=1/2 triangular layered compound NaNiO2: a single crystal study