2-DIMENSIONAL CRITICAL FLUCTUATIONS IN MNPS3

A single crystal of MnPS3, a quasi-two-dimensional antiferromagnet wit h a Neel temperature of 78 K, has been grown using a novel technique. The crystal is large enough to carry out critical and inelastic neutro n scattering experiments. Diffraction measurements on the PRISMA instr ument at the ISIS facility reveal temperature-dependent rod-like scatt ering at 100 K, well above the Neel temperature. These features are du e to two-dimensional critical fluctuations. (C) 1998 Elsevier Science B.V. All rights reserved.