Structural, electrical and magnetic characterization of the double perovskites Sr2CrMO6 (M=Mo, W): B′ 4d–5d system

We report on the preparation and characterization of the variation of B′-site transition metal in Sr2CrMO6 (M=Mo, W) with double perovskites structure. The magnetic susceptibility shows that Sr2CrMoO6 and Sr2CrWO6 are antiferromagnets with <f>TN=40</f> and 30 K at <f>H=1</f> T, respectively. In addition, a large magnetoresistance ratio (MR) of ∼38% (<f>H=3</f> T) at 5 K was observed in the Sr2CrWO6 compound. However, the Sr2CrMoO6 compound does not show any significant MR even at high fields (MR∼4%; <f>H=3</f> T and 5 K). The measured O K-edge X-ray absorption is in agreement with the calculated O p-density of states for both compounds. [Copyright &y& Elsevier]