کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1330247 | 1500122 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enhanced superconductivity of SmFeAsO co-doped by Scandium and Fluorine to increase chemical inner pressure Enhanced superconductivity of SmFeAsO co-doped by Scandium and Fluorine to increase chemical inner pressure](/preview/png/1330247.png)
Sm1−x/3Scx/3FeAsO1−xFx (x=0.09–0.27) were synthesized by the mechanical alloying and subsequent low temperature rapid sintering (2 h at 950 °C). The superconducting transition temperature (Tc) increased with the doping level of x. The optimal doping achieved a Tc up to 53.5 K in Sm0.93Sc0.07FeAsO0.79F0.21. The higher Tc value was attributed to the increased chemical inner pressure from local lattice distortion induced by smaller-size dopants, which was further confirmed by Sm1−xScxFeAsO0.88F0.12 (x=0.04, 0.08, 0.12). Accordingly, larger lattice distortion can enhance the superconductivity below the doping limit. Similar phenomenon was also observed in the La1−xYxFeAsO0.8F0.2 (x=0.4, 0.5, 0.6).
The introduction of Sc3+ and F− in SmFeAsO leads to higher chemical inner pressure generated by larger lattice distortion, which is the reason of the improved Tc.Figure optionsDownload as PowerPoint slideHighlights
► The superconducting properties of Sm1−x/3Scx/3FeAsO1−xFx are investigated.
► The co-doping of Sc3+ and F− in SmFeAsO leads to higher chemical inner pressure.
► Higher chemical inner pressure is beneficial to the superconductivity.
► The co-doped samples of La1−xYxFeAsO0.8F0.2 further demonstrate the assumption.
Journal: Journal of Solid State Chemistry - Volume 194, October 2012, Pages 59–64