Abstract
Polycrystalline samples of Ln 3ReO 7 ( Ln= Gd, Tb, and Dy ) have been prepared. The structures of these compounds were determined by X-ray diffraction measurements. They crystallize in a superstructure of cubic fluorite (space group, Cmcm for Ln= Gd and Tb ; C222 1 for Ln=Dy). The Re ion is octahedrally coordinated by six oxygens and the distorted octahedra share corners forming a zig-zag chain parallel to the c-axis. The samples have been characterized by magnetic susceptibility and specific heat measurements. The compounds show complex magnetic behavior at low temperatures. The Gd, Tb, and Dy compounds show magnetic transitions at 7.0, 14.0, and 2.8 K, respectively. The magnetic behavior below the transition temperatures is complicated, and there is a large difference in the temperature dependence of the magnetic susceptibility measured under zero-field-cooled (ZFC) condition and under field-cooled (FC) condition.
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