Effect of Nb doping on the microstructure and superconducting properties of FeSe

Effect of Nb doping on the microstructure and superconducting properties of FeSe
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Nb掺杂对FeSe微观结构和超导性能的影响

DOI:
10.1016/j.scriptamat.2019.05.012
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发表时间:
2019-08
期刊:
影响因子:
6
通讯作者:
Li Huijun
Li Huijun
中科院分区:
材料科学1区
文献类型:
--
作者:
Ma Qingshuang;Li Xinhua;Ma Zongqing;Yu Liming;Li Huijun

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本文报道了用固相烧结法制备的Nb掺杂FeSe的超导性能。随着Nb掺杂量的增加,Nb进入FeSe晶格并取代Fe位。结果表明,FeNb0.04Se的超导转变温度明显提高,达到13.6K,比未掺杂的FeSe提高了27%,上临界场提高到28 T。此外,Nb的掺杂可以显著抑制临界电流密度随磁场的衰减,从而改善FeSe在高磁场下的输运性能。
We reported the enhanced superconducting performance of Nb doped FeSe prepared by solid-state sintering. With the increase of Nb doping, Nb incorporated FeSe lattice and substituted Fe sites. Thus the texture of tetragonal FeSe become more compact, the superconducting transition temperature is distinctly enhanced up to 13.6 K in FeNb0.04Se, which is enhanced by 27% as compared with that of undoped FeSe, and the upper critical field is enhanced up to 28 T. Moreover, Nb doping can significantly suppress the decay of critical current density with magnetic fields, and then improve the transport performance of FeSe at high magnetic fields.
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