Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure

被引:30
|
作者
Takahashi, H. [1 ]
Soeda, H. [1 ]
Nukii, M. [1 ]
Kawashima, C. [1 ]
Nakanishi, T. [2 ]
Iimura, S. [3 ]
Muraba, Y. [4 ]
Matsuishi, S. [4 ]
Hosono, H. [3 ,4 ]
机构
[1] Nihon Univ, Coll Humanities & Sci, Dept Phys, Tokyo 156, Japan
[2] Tokyo Denki Univ, Dept Phys, Sch Sci & Technol Future Life, Tokyo 101, Japan
[3] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 227, Japan
[4] Tokyo Inst Technol, Mat Res Ctr Element Strategy, Yokohama, Kanagawa 227, Japan
来源
SCIENTIFIC REPORTS | 2015年 / 5卷
关键词
D O I
10.1038/srep07829
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The 1111-type iron-based superconductorLnFeAsO1-xFx (Ln stands for lanthanide) is the first material with a Tc above 50 K, other than cuprate superconductors. Electron doping into LaFeAsO by H, rather than F, revealed a double-dome-shaped Tc-x diagram, with a first dome (SC1, 0.05, x, 0.20) and a second dome (SC2, 0.2, x, 0.5). Here, we report the Tc for the whole hydrogen-doping range in LaFeAsO1-xHx under pressures of up to 19 GPa. Tc rises to 52 Kat 6 GPa for theTc-valley composition between the twoTc domes. This is the first instance of theTc exceeding 50 K in La-1111-type iron-based superconductors. On the other hand, the Tc of SmFeAsO1-xHx decreased continually, keeping its single-dome structure up to 15 GPa. The present findings strongly suggest that the main reason for realization of the Tc.50 K observed in RE-1111 compounds (RE: Pr, Sm, and Gd) at ambient pressure is the merging of SC1 and SC2.
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页数:6
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