Abstract
The magnetic properties of are analyzed in the mean-field/random-phase approximation using a basis of clusters with four spins along the -axis chains of Co ions. The model gives a unifying account of the bulk properties, the spin waves, and the higher-order cluster-spin excitations. The theory describes accurately the neutron scattering measurements of the excited doublet of the ions in both the antiferromagnetic and the paramagnetic phases. The theory has been applied by Larsen et al. [Phys. Rev. B 96, 174424 (2017)] for analyzing the quantum phase transition at a transverse field of 160 kOe and is found to agree closely with their observations.
2 More- Received 12 October 2017
- Revised 22 December 2017
DOI:https://doi.org/10.1103/PhysRevB.97.024423
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