The double perovskite (Sr2CrWO6)has been prepared in polycrystalline state by solid state reaction. At room temperature, the crystal structure is Cubic (space group: Fm3m) with lattice parameter of 7.8200(2) (A). Both rho (H = 0) and rho (H = 5 T) show a semiconductor-like behavior over the whole temperature range up to 5 K. The highest MR(magnetoresistance) value of 55% (14 = 5 T) was observed at 25 K. The valence state of Cr was determined by the X-ray absorption spectroscopy at Cr-L edge. The results, compared to the standard sample, show that the valence state of Cr is 3+.
關聯:
INTERNATIONAL JOURNAL OF MODERN PHYSICS B v.19 n.1-3 Pages: 537-540 Part: Part 2
