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Effects of B′-site transition metal on the properties of double perovskites Sr2FeMO6 (M=Mo, W): B′ 4d-5d system |
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| Authors: | TS Chan GY Guo JG Lin C-R Chang |
| Institution: | a Department of Chemistry and Center for Nano Storage Research, National Taiwan University, Taipei 106, Taiwan, ROC b Department of Physics, National Taiwan University, Taipei 106, Taiwan c National Nano Device Laboratories, Hsinchu 300, Taiwan d Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan e National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan f Department of Physics and Center for Nano Storage Research, National Taiwan University, Taipei 106, Taiwan |
| Abstract: | The crystal structure, magnetic and magnetotransport properties of the variation of B′-site transition metal in Sr2FeMO6 (M=Mo, W) with double perovskites structure have been investigated systematically. Measurements of magnetization vs. temperature at H=5 T show that Sr2FeMoO6 is a ferromagnet and Sr2FeWO6 is an antiferromagnet with TN∼35 K. Additionally, the large magnetoresistance ratio (MR) of ∼22% (H=3 T) at room temperature (RT) was observed in the Sr2FeWO6 compound. However, the Sr2FeMoO6 compound did not show any significant MR even at high fields and RT (MR∼1%; H=3 T and 300 K). The implications of these findings are supported by band structure calculations to explain the interaction between the 4d(Mo) and 5d(W) orbitals of transition metal ions and oxygen ions. |
| Keywords: | 61 66 Fn 71 20Ps 74 47 &minus m 75 20 Ck 75 47 Pq |
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