Magnetic properties of lanthanide rhenium oxides Ln3ReO7 (Ln=Sm, Eu, Ho)

Ternary lanthanide rhenium oxides Ln3ReO7 (Ln=Sm, Eu, Ho) were prepared and their structures were determined by X-ray diffraction measurements. They crystallize in an orthorhombic superstructure of cubic fluorite (space group Cmcm for Ln=Sm, Eu; C2221 for Ln=Ho). The magnetic properties were characterized by magnetic susceptibility and specific heat measurements from 1.8 to 400 K. The Sm3ReO7 shows an antiferromagnetic transition at 1.9 K. The Eu3ReO7 indicates a magnetic anomaly at 12 K. On the other hand, the results of the specific heat measurements indicate that both Sm3ReO7 and Eu3ReO7 undergo a structure transition at 270 and 350 K, respectively. The Ho3ReO7 is paramagnetic down to 1.8 K.

Crystal structures of Eu3ReO7 (a) and Ho3ReO7 (b). Sm3ReO7 shows an antiferromagnetic transition at 1.9 K, and Eu3ReO7 indicates a magnetic anomaly at 12 K. Both compounds undergo a structure transition at 270 and 350 K, respectively.Figure optionsDownload as PowerPoint slide