MAGNETIZATION OF SINGLE-CRYSTAL YFEMNO4

Magnetization measurements up to 143 kOe and susceptibility measurements have been carried out on a single crystal of hexagonal YFeMnO4. This oxide exhibits a two-dimensional antiferromagnetic character, and shows spin-glass-like properties at low temperatures. The Weiss temperature obtained from high temperature paramagnetic susceptibility is - 800 K, while the critical temperature where the thermoremanent magnetization disappears is only 60 K. This result suggests that both the magnetic frustration due to competing exchange interaction and the random charge distribution of the Fe and Mn ions play important roles in this magnetism.