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Quantum corrections to the spin-wave spectrum of La$_2$CuO$_4$ in an external magnetic field

I. Ya. Korenblit·A. Aharony·O. Entin-Wohlman
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Abstract

The effects of quantum fluctuations on the magnetic field dependence of the spin-wave gaps in the lamellar antiferromagnet La$_2$CuO$_4$ are considered. Nonlinear corrections to the spin-wave spectrum are calculated to leading order in 1/S, where $S$ 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 $g$-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$_2$ planes is also discussed.

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I. Ya. Korenblit, A. Aharony, O. Entin-Wohlman. 2007-01-08. Quantum corrections to the spin-wave spectrum of La$_2$CuO$_4$ in an external magnetic field. https://doi.org/10.1103/physrevb.75.174420

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