Abstract
The magnetic properties of double perovskite oxide Sr 2 FeWO 6 have been reported. The magnetic susceptibility and Mossbauer effect of 57 Fe show that this compound is an antiferromagnet with T N =37 K. The Mossbauer parameters below ∼20 K are the center shift of +1.2 mm/s relative to metallic iron, the quadrupole splitting of 1.9 mm/s and the hyperfine field of ∼110 kOe. The quadrupole splitting has a strong temperature dependence. From these data, we conclude that Fe in Sr 2 FeWO 6 is in the Fe 2+ high-spin state, while the hyperfine field seems to be quite small. The cell volume shows a large increase compared to other Sr 2 FeTO 6 ( T= Mo, Re, etc.), which is in the Fe 3+ high-spin state. These results suggest that these compounds have a strongly coupled charge and lattice systems.
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