LAUSR

Abstract The perovskite-type compounds containing both rare earth and rhenium Sr 2 LnReO 6 (Ln=Y, Tb-Lu) have been prepared. Powder X-ray diffraction measurements and Rietveld analysis show that Ln 3+ and Re 5+ ions are structurally ordered at the B site of the perovskite SrBO 3 . Magnetic anomalies are found in their magnetic susceptibility and specific heat measurements at 2.6–20 K for Ln=Y, Tb, Dy, Yb, Lu compounds. They are due to magnetic interactions between Re 5+ ions. The results of the magnetic hysteresis and remnant magnetization measurements for Sr 2 YReO 6 and Sr 2 LuReO 6 indicate that the antiferromagnetic interactions between Re 5+ ions below transition temperatures have a weak ferromagnetic component. The analysis of the magnetic specific heat data for Sr 2 YbReO 6 shows that both the Yb 3+ and Re 5+ ions magnetically order at 20 K. For the case of Sr 2 DyReO 6 , magnetic ordering of the Re 5+ moments occurs at 93 K, and with decreasing temperature, the moments of Dy 3+ ferromagnetically order at 5 K from the measurements of magnetic susceptibility and specific heat.