Synthesis by oxalic (citric) route and electrical and magnetic characterization of Sr2FeMoO6 perovskite
| Autor: | C. Valsangiacom, L. Stoica, G. Aldica, Petre Badica, C. Plapcianu |
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| Rok vydání: | 2007 |
| Předmět: |
Magnetization
Materials science Magnetoresistance Condensed matter physics Ferromagnetism Electrical resistivity and conductivity Transition temperature Analytical chemistry Condensed Matter Physics Saturation (magnetic) Electronic Optical and Magnetic Materials Magnetic field Perovskite (structure) |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 311:665-670 |
| ISSN: | 0304-8853 |
| Popis: | Sr 2 FeMoO 6 was synthesizes by soft chemistry route using citric and/or oxalic acid as complexing agents. This method provides good compositional control with promising results as a base for further improvements. The material shows complex temperature- and field- (magnitude and orientation) dependent electro-magnetic behavior as probed by magnetic and transport measurements. The zero-field cooling curves of magnetization versus temperature taken at different magnetic fields, show two temperature regions separated by a transition temperature T cups ZFC . When H increases, T cups ZFC values decrease. At 5 K and 5 T the saturation moment is 3.55 μ B per formula unit, and the coercitive force is 0.021 T. The relative value of the magnetoresistive effect (i.e. 100 ( ρ H − ρ 0 )/ ρ H , %, with ρ being resistivity) at 5 K is 68% and 36% when applied field H is parallel and perpendicular the measuring current I , respectively. The results are discussed in relation to magnetic sublattices and the interaction that produces anti-site defects and spin-dependent electron anisotropy. |
| Databáze: | OpenAIRE |
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