Quantum corrections to the spin-wave spectrum of LaCuO in an external magnetic field
arXiv:cond-mat/0701143 · doi:10.1103/PhysRevB.75.174420
Abstract
The effects of quantum fluctuations on the magnetic field dependence of the spin-wave gaps in the lamellar antiferromagnet LaCuO are considered. Nonlinear corrections to the spin-wave spectrum are calculated to leading order in 1/S, where is the localized spin. The nearest-neighbor exchange interactions between the Cu spins as well as the Dzyaloshinskii-Moriya interactions are taken into account. Using the experimental values of the components of the -factor tensor, we get a satisfactory agreement with the experimental results for the field dependence of the gaps by Gozar {\it et al.} [Phys. Rev. Lett. {\bf 93}, 027001 (2004)], and obtain consistent values of the in-plane and inter-plane coupling constants. The field dependence of the dispersion of spin waves propagating perpendicular to the CuO planes is also discussed.
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