Magnetization Plateaus of the \(S=2\) Antiferromagnetic Chain with Competing Anisotropies

Abstract

The magnetization process of the \(S=2\) antiferromagnetic chain with two competing anisotropies is investigated using the numerical diagonalization of finite-size clusters and some size scaling analyses. As a result, it is found that the system possibly exhibits the translational symmetry broken magnetization plateaus at 1/4 and 3/4 of the saturation magnetization, as well as at 1/2. The phase diagrams for the anisotropies at 1/4, 3/4 and 1/2 magnetizations are presented. In addition, the magnetization curves for several typical anisotropy parameters are obtained.