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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
; | | Date: |
8 Jan 2007 | | Subject: | Materials Science | | 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. {f 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. | | Source: | arXiv, cond-mat/0701143 | | Services: | Forum | Review | PDF | Favorites | |
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