Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 16, Issue 11, Pages S773-S778Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/16/11/028
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The field induced magnetic phase transitions of Cs2CuBr4 were investigated by means of a magnetization process and neutron scattering experiments. This system undergoes a magnetic phase transition at Neel temperature T-N = 1.4 K at zero field, and exhibits a magnetization plateau at approximately one third of the saturation magnetization for the field directions H parallel to b and H parallel to c. In the present study, an additional symptom of the two-third magnetization plateau was found in the field derivative of the magnetization process. The magnetic structure was found to be incommensurate with the ordering vector Q = (0, 0.575, 0) at zero field. With increasing magnetic field parallel to the c-axis, the ordering vector increases continuously and is locked at Q = (0, 0.662, 0) in the plateau field range 13.1 T < H < 14.4 T. This indicates that the collinear up-up-down spin structure is stabilized by quantum fluctuation at the magnetization plateau.
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