Synthesis, Structure, and Physical Properties of the Polar Magnet DyCrWO.

It has recently been reported that the ordered aeschynite-type polar ( Pna2) magnets RFeWO (R = Eu, Tb, Dy, Y) exhibit type II multiferroic properties below T ∼ 15-18 K. Herein, we report a comprehensive investigation of the isostructural oxide DyCrWO and compare the results with those of DyFeWO. The cation-ordered oxide DyCrWO crystallizes in the same polar orthorhombic structure and undergoes antiferromagnetic ordering at T = 25 K. Contrary to DyFeWO, only a very weak dielectric anomaly and magnetodielectric effects are observed at the Néel temperature and, more importantly, there is no induced polarization at T. Furthermore, analysis of the low-temperature neutron diffraction data reveals a collinear arrangement of Cr spins but a noncollinear Dy-spin configuration due to single-ion anisotropy. We suggest that the collinear arrangement of Cr spins may be responsible for the absence of electric polarization in DyCrWO. A temperature-induced magnetization reversal and magnetocaloric effects are observed at low temperatures.