A low temperature magnetization and neutron diffraction study of Ca2NiWO6

Neutron diffraction and DC magnetization measurements on polycrystalline double perovskite Ca2NiWO6 were carried out to determine its low temperature magnetic structure. The compound has a monoclinic structure down to the lowest measured temperature (13 K). Magnetization measurements indicates that the sample has an antiferromagnetic ordering with a Néel temperature of ∼50 K. Our low temperature neutron diffraction measurements showed an antiferromagnetic alignment of Ni moments below 50 K. The magnetic moment of the Ni2+ ions found from neutron diffraction was 2.2(1) μB, at 13 K and was oriented within the b-c plane. An interesting correlation between Néel temperature and band width is found for some double perovskites including Ca2NiWO6.