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We report inelastic neutron scattering measurements of the spin dynamics inthe layered hexagonal magnet 2H-AgNiO2 which has stacked triangular layers ofantiferromagnetically-coupled Ni2+ spins (S=1) ordered in a collinearalternating stripe pattern. We observe a broad band of magnetic excitationsabove a small gap of 1.8 meV and extending up to 7.5 meV, indicating stronglydispersive excitations. The measured dispersions of the boundaries of thepowder-averaged spectrum can be quantitatively explained by a linear spin-wavedispersion for triangular layers with antiferromagnetic nearest- and weaknext-nearest neighbor couplings, a strong easy-axis anisotropy and additionalweak inter-layer couplings. The resulting dispersion relation has global minimanot at magnetic Bragg wavevectors but at symmetry-related soft points and weattribute this anomalous feature to the strong competition between theeasy-axis anisotropy and the frustrated antiferromagnetic couplings. We havealso calculated the quantum corrections to the dispersion relation to order 1/Sin spin-wave theory by extending the work of Chubukov and Jolicoeur [Phys. Rev.B v46, 11137 (1992)] and find that the presence of easy-axis anisotropysignificantly reduces the quantum renormalizations predicted for the isotropicmodel.

Spin dynamics of frustrated easy-axis triangular antiferromagnet 2H-AgNiO2 explored by inelastic neutron scattering