Calculation of the static magnetization of metamagnetic La2CuO4

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Abstract
Interactions in La2CuO4 are predominantly antiferromagnetic. However, a strong field-induced transition is seen in the static magnetic susceptibility which points to the existence of a net ferromagnetic moment in the CuO layers. Here, this net ferromagnetic moment is incorporated into a description of the CuO layers by the inclusion of a modified Dzyaloshinskii–Moriya term in the Hamiltonian. The spin-wave spectrum in the presence of an applied field is calculated with this Hamiltonian and the ground state is determined as a function of applied field from the free energy. A calculation of the static magnetization as a function of applied field perpendicular to the CuO layers is used to determine the parameters of the model. Comparison is made with experiment.