Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-04-05
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures, 4 eps files, ptptex, will appear in Supplement of Progress in Theoretical Physics
Scientific paper
10.1143/PTPS.145.101
The crystal structure of Cs$_2$CuBr$_4$ is the same as that of Cs$_2$CuCl$_4$, which has been characterized as a spin-1/2 quasi-two-dimensional frustrated system. The magnetic properties of Cs$_2$CuBr$_4$ were investigated by magnetization and specific heat measurements. 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 plateau at 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 appears to be of the first order. The mechanism leading to the magnetization plateau is discussed.
Goto Tomotsugu
Ishikawa Fumihiro
Katori Hiroko Aruga
Mitamura H.
Ono Takafumi
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