We have investigated the magnetic and magnetotransport properties of monophasic double perovskites Sr2FeMO6 (M = Mo, W). Magnetic measurements indicate that SFMO is a ferromagnet and SFWO is an antiferromagnet with T-N = 35 K at H = 5 T. Large magnetoresistance ratio (MR) of similar to22% (H = 3 T) at room temperature (RT) was observed in the SFWO compound. However, the SFMO compound did not show any significant MR even at high fields and RT (MR similar to 1%; H = 3 T and 300 K). The changes observed by physical measurements are supported by band structure calculations to explain the interaction between the 3d(Fe), 4d(Mo) and 5d(W) orbitals of transition metal ions and oxygen ions.
關聯:
INTERNATIONAL JOURNAL OF MODERN PHYSICS B Volume: 17 Issue: 18-20 Pages: 3500-3502 Part: Part 2
