The Angular Dependent Magnetic Phase Diagram of Cs$_{2}$CuCl$_{4}$
ORAL
Abstract
We present a determination of the phase diagram of the $S = {1\over2}$ quasi-2D triangular Heisenberg quantum antiferromagnet Cs$_{2}$CuCl$_{4}$ at temperatures to down 100mK and fields up to the saturation field of 9 tesla. We have determined the low temperature phase boundaries as a function of angle to the magnetic field using a unique low temperature rotatable calorimeter. Measurements at several angles intermediate to the in-plane and perpendicular directions elucidate the evolution of the complex phase diagram between these two principal axis. For fields directed along the a-axis (perpendicular to the plane of the triangular lattice), we observe a series of magnetic phases. New, unexpected phases arise at intermediate angles as we rotate the magnetic field away from the a-axis, into the bc plane. Variation of phase boundaries with field angle within the bc plane reflect interactions due to the Dzyaloshinskii-Moriya mechanism.
*A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490, the State of Florida, and the U.S. Department of Energy.
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