Magnetic ground states in the three Os6+ (5d2) double perovskites Ba2MOsO6 (M=Mg,Zn,and Cd) from Néel order to its suppression

Three closely related double perovskites (DP) based on the 5d2 ion, Os6+,Ba2MOsO6, with M=Mg, Zn, and Cd have been prepared and characterized using x-ray (XRD) and neutron diffraction (ND), dc magnetization, heat capacity, and muon spin relaxation (μSR) techniques. All three are cubic, Fm-3m, at ambient temperature from XRD with Δd/d∼5×10−4 resolution. For both M=Mg and Zn, ND data at 3.5 K and lower, Δd/d=2×10−3, resolution show no signs of a …