02.09.2011
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02.09.2011

Journal of Alloys and Compounds
Volume 509, Issue 40, 6 October 2011, Pages 9598-9603




Strong correlation between structural, magnetic and transport properties of non-stoichiometric Sr2FexMo2−xO6 (0.8 ≤ x ≤ 1.5) double perovskites


Y. Markandeyaa, K. Sureshb and G. Bhikshamaiaha, Corresponding Author Contact Information, E-mail The Corresponding Author





a Department of Physics, Osmania University, Hyderabad 500007, India


b International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500005, India




Received 3 May 2011;


revised 22 June 2011;


accepted 23 June 2011.


Available online 18 July 2011.












Abstract



Sr2FexMo2−xO6 (x = 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4 and 1.5 wt.%) (SFMO) double perovskite oxides of different compositions have been prepared by sol–gel method. These materials were subjected to X-ray diffraction and found that crystal structure changes from tetragonal to cubic around x = 1.2 wt.%. Lattice parameters and unit cell volume have been calculated using X-ray diffraction data. Magnetization studies have been carried out using Vibrating Sample Magnetometer ranging from −15 kOe to +15 kOe and saturation magnetization (Ms) has been determined. Electrical resistivity and magnetoresistance studies have been carried out in the magnetic field range of −40 kOe to +40 kOe keeping the temperature constant at 5, 150 and 300 K using standard four-probe method. Resistivity studies have also been carried out in the temperature ranging from 5 to 300 K keeping the magnetic field constant at 0, 10, 20 and 40 kOe. Maximum degree of Fe/Mo ordering (ηmax) of SFMO has been calculated and compared with magnetic and transport properties. It has been found that there is a strong correlation between 3 parameters ηmax, Ms and MR (%), i.e. all of them show a maximum at x = 1.0 wt.% and decreases as x deviates from 1.0 in SFMO. It has been also found that there is a different resistivity behavior between x ≤ 1.2 wt.% and x > 1.2 wt.% samples of SFMO. Semiconductor metal transition temperature was found to be maximum at x = 1.0 wt.%.





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