Antiferromagnetic transitions of osmium-containing rare earth double perovskites Ba2LnOsO6 (Ln=rare earths)

The perovskite-type compounds containing both rare earth and osmium Ba2LnOsO6 (Ln=Pr, Nd, Sm–Lu) have been prepared. Powder X-ray diffraction measurements and Rietveld analysis show that Ln3+ and Os5+ ions are structurally ordered at the M site of the perovskite BaMO3. Magnetic susceptibility and specific heat measurements show that an antiferromagnetic ordering of Os5+ ions has been observed for Ba2LnOsO6 (Ln=Pr, Nd, Sm, Eu, Gd, Lu) at 65–71 K. Magnetic ordering of Ln3+ moments occurs when the temperature is furthermore decreased. - Graphical abstract: The perovskite-type compounds containing both rare earth and osmium Ba2LnOsO6 (Ln=Pr, Nd, Sm–Lu) have been prepared. An antiferromagnetic ordering of Os5+ ions has been observed for Ba2LnOsO6 (Ln=Pr, Nd, Sm, Eu, Gd, Lu) at 65–71 K. Measurements and analysis of the specific heat for Ba2PrOsO6 show that magnetic ordering of the Pr3+ moments should have occurred at ∼20 K. Display Omitted