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Download fileSynthesis, Structure, and Physical Properties of the Polar Magnet DyCrWO6
journal contribution
posted on 26.09.2018, 12:48 authored by Somnath Ghara, Francois Fauth, Emmanuelle Suard, Juan Rodriquez-Carvajal, A. SundaresanIt has recently been reported that
the ordered aeschynite-type polar (Pna21) magnets RFeWO6 (R = Eu, Tb, Dy, Y) exhibit type II multiferroic
properties below TN ∼ 15–18
K. Herein, we report a comprehensive investigation of the isostructural
oxide DyCrWO6 and compare the results with those of DyFeWO6. The cation-ordered oxide DyCrWO6 crystallizes
in the same polar orthorhombic structure and undergoes antiferromagnetic
ordering at TN = 25 K. Contrary to DyFeWO6, only a very weak dielectric anomaly and magnetodielectric
effects are observed at the Néel temperature and, more importantly,
there is no induced polarization at TN. 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 DyCrWO6. A temperature-induced
magnetization reversal and magnetocaloric effects are observed at
low temperatures.