Electron doping effect on structural and magnetic phase transitions in Sr2−xNdxFeMoO6 double perovskites |
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Authors: | AK Azad S-G Eriksson A Eriksson |
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Institution: | a Department of Inorganic Chemistry, Göteborg University, SE-41296 Göteborg, Sweden b Department of Chemistry, University of Balochistan, Quetta, Pakistan c Department of Engineering Sciences, Uppsala University, SE-75121 Uppsala, Sweden |
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Abstract: | Polycrystalline Sr2−xNdxFeMoO6 (x=0.0, 0.1, 0.2, 0.4) materials have been synthesized by a citrate co-precipitation method and studied by neutron powder diffraction (NPD) and magnetization measurements. Rietveld analysis of the temperature-dependent NPD data shows that the compounds (x=0.0, 0.1, 0.2) crystallize in the tetragonal symmetry in the range 10-400 K and converts to cubic symmetry above 450 K. The unit cell volume increases with increasing Nd3+ concentration, which is an electronic effect in order to change the valence state of the B-site cations. Antisite defects at the Fe-Mo sublattice increases with the Nd3+ doping. The Curie temperature was increased from 430 K for x=0 to 443 K for x=0.4. The magnetic moment of the Fe-site decreases while the Mo-site moment increases with electron doping. The antiferromagnetic arrangement causes the system to show a net ferrimagnetic moment. |
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Keywords: | Double perovskite Nuclear structure Magnetic structure Electron doping Neutron diffraction Magnetization measurement CMR materials |
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