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Effect of F Doping on Fabrication and Superconductivity of SmO1-xFδFeAs Compound
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Effect of F Doping on Fabrication and Superconductivity of SmO1-xFδFeAs Compound
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National Basic Research Program of China (2006CB601005); National High Technology Research and Development Program of China (2009AA032401); National Natural Science Foundation of China (50771003 and 50802004); Beijing Municipal Natural Science Foundation (2092006)

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    摘要:

    研究了F摻雜對鐵基超導(dǎo)體SmO0.7F0.3FeAs的制備和性能的影響。利用二次固相反應(yīng)在1120 ℃保溫40 h制備出超導(dǎo)臨界轉(zhuǎn)變溫度 (Tc) 為56.5 K的SmO0.7F0.3FeAs超導(dǎo)體樣品，其臨界電流密度Jc為2.4×105 A/cm2 (10 K，0 T)。研究發(fā)現(xiàn)，SmO1-xFxFeAs樣品的Tc受F含量的強烈影響，晶格參數(shù)的變化也是誘導(dǎo)SmO1-xFxFeAs超導(dǎo)體的Tc變化的原因之一。在此基礎(chǔ)上詳細研究了F元素過摻雜對鐵基超導(dǎo)體SmO1-xFδFeAs (δ＞x) 制備參數(shù)和性能的影響。F元素過量時，在不降低SmO1-xFδFeAs超導(dǎo)性能的情況下，F(xiàn)元素過摻雜可以一定程度地降低樣品制備時的熱處理溫度和極大地縮短熱處理時間。1100 ℃時保溫20 h制備的SmO0.7F0.35FeAs和SmO0.7F0.4FeAs樣品的Tc分別為56和55 K；其臨界電流密度Jc分別為1.9×105和1.7×105 A/cm2 (10 K，0 T)。

    Abstract:

    We report the effect of fluorine doping on the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFδFeAs (δ≥x) compound. The fluorine over-doping can greatly reduce the heat treatment temperature and the heat treatment time, meanwhile the superconductivity of the SmO1-xFδFeAs samples does not reduce. The critical transition temperature (Tc) is as high as 56.5 K for the SmO0.7F0.3FeAs sample prepared by the two-step solid state reaction method at 1120 °C for 40 h, the Jc of the sample is 2.4×105 A/cm2 (10 K, 0 T). Tc of the fluorine over-doped SmO0.7F0.35FeAs and SmO0.7F0.4FeAs samples prepared by the two-step solid state reaction method at 1100 °C for 20 h are 56 and 55 K, respectively. Jc of the both samples are 1.9×105 and 1.7×105 A/cm2 (10 K, 0 T), respectively.

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劉志勇,索紅莉,馬 麟,趙俊靜,倪寶榮,郭志超,閆鑌杰,劉 敏,吳紫平,周美玲. Effect of F Doping on Fabrication and Superconductivity of SmO1-xFδFeAs Compound[J].稀有金屬材料與工程,2012,41(7):1144~1148.[Liu Zhiyong, Suo Hongli, Ma Lin, Zhao Junjing, Ni Baorong, Guo Zhichao, Yan Binjie, Liu Min, Wu Ziping, Zhou Meiling. Effect of F Doping on Fabrication and Superconductivity of SmO1-xFδFeAs Compound[J]. Rare Metal Materials and Engineering,2012,41(7):1144~1148.]
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  • 收稿日期:2011-07-21
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