The magnetization process in the 2-dimensional J 1 -J 2 model
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We study the α = J 2 /J 1 -dependence of the magnetization process in the J1-J2 model on a square lattice with frustrating couplings J2 along the diagonals. Perturbation expansions around α = J 2 /J 1 = 0 and α -1 = 0 yield an adequate description of the magnetization curve in the antiferromagnetic and collinear antiferromagnetic phase, respectively. The transition from one phase to the other ( 0.5 < α < 0.7) leaves pronounced structures in the longitudinal and transverse structure factors at = (π,π) and = (0,π).
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