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The crystal structure of Cs$_2$CuBr$_4$ is the same as that ofCs$_2$CuCl$_4$, which has been characterized as a spin-1/2quasi-two-dimensional frustrated system. The magnetic properties ofCs$_2$CuBr$_4$ were investigated by magnetization and specific heatmeasurements. The phase transition at zero magnetic field was detected at$T_{\rm N}=1.4$ K. It was observed that the magnetization curve has a plateauat about one-third of the saturation magnetization for magnetic field $H$parallel to the $b$- and $c$-axes, while no plateau was observed for$H\parallel a$. The field-induced phase transition to the plateau state appearsto be of the first order. The mechanism leading to the magnetization plateau isdiscussed.Comment: 6 pages, 4 figures, 4 eps files, ptptex, will appear in Supplement of  Progress in Theoretical Physic

Magnetic Phase Transition and Magnetization Plateau in Cs2CuBr4

Magnetic Phase Transition and Magnetization Plateau in Cs₂CuBr₄