Magnetic Phase Diagram of the Quasi-Two-Dimensional S = 1/2 Antiferromagnet Cs2CuBr4

1 December 2006

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 850 (1) , 1093
https://doi.org/10.1063/1.2355085

Abstract

Cs₂CuBr₄ is one of the best candidates for the spin‐1/2 Heisenberg antiferromagnet on the triangular lattice. To date, it is the only spin‐1/2 material in which a magnetization plateau has been observed at 1/3 of the saturation magnetization — the hallmark of the triangular‐lattice Heisenberg antiferromagnet. We have made a detailed determination of the magnetic phase diagram of Cs₂CuBr₄ in magnetic fields up to 18 T, using specific‐heat and magnetocaloric‐effect measurements. The results for the field direction parallel to the c axis of the sample indicate that the transition between the phase at the plateau of magnetization and the adjacent ordered phases is first order.

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