Magnetic and calorimetric studies of double perovskites Ba2LnReO6 (Ln = Y, Nd, Sm–Lu)

Abstract

The perovskite-type compounds Ba₂LnReO₆ (Ln = Y, Nd, Sm–Lu) have been synthesized. Powder X-ray diffraction measurements and Rietveld analysis show that they are monoclinic with space group P2₁/n and that Ln³⁺ and Re⁵⁺ ions are structurally ordered. Anomalies are found in their magnetic susceptibility and specific heat measurements, which suggest an antiferromagnetic ordering of Re⁵⁺ ions for Ba₂LnReO₆ (Ln = Y, Nd, Sm, Gd–Ho, Lu) and that of Tb³⁺ ions for Ba₂TbReO₆.