Magnetization ramp and XXZ anisotropy of kagome lattice antiferromagnets

Sakai, Toru; Nakano, Hiroki*; Isoda, Makoto*; Okunishi, Koichi*

The previous study indicated that a magnetization plateau-like behavior at 1/3 of saturation magnetization is a new phenomena, so-called a magnetization ramp. In the present work we investigate a change of the anomalous behavior under the XXZ anisotropy. As a result, we found that as the XXZ anisotropy is varied from the Ising and XY sides, the magnetization plateau vanishes at a critical point.