Experimental evidence of Tc enhancement without the influence of spin fluctuations: NMR study on LaFeAsO1-xHx under a pressure of 3.0 GPa

被引:12
|
作者
Kawaguchi, N. [1 ]
Fujiwara, N. [1 ]
Iimura, S. [2 ,3 ]
Matsuishi, S. [2 ,3 ]
Hosono, H. [2 ,3 ]
机构
[1] Kyoto Univ, Grad Sch Human & Environm Studies, Sakyo Ku, Kyoto 6068501, Japan
[2] Tokyo Inst Technol, MSL, Midori Ku, 4259 Nagatsuda, Yokohama, Kanagawa 2268503, Japan
[3] Tokyo Inst Technol, FRC, Midori Ku, 4259 Nagatsuda, Yokohama, Kanagawa 2268503, Japan
关键词
SUPERCONDUCTIVITY; RELAXATION;
D O I
10.1103/PhysRevB.94.161104
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electron-doped high-transition-temperature (T-c) iron-based pnictide superconductor LaFeAsO1-xHx has a unique phase diagram: Superconducting double domes are sandwiched by antiferromagnetic phases at ambient pressure and they turn into a single dome with a maximum T-c that exceeds 45 K at a pressure of 3.0 GPa. We studied whether spin fluctuations are involved in increasing T-c under a pressure of 3.0 GPa by using the As-75 nuclear magnetic resonance (NMR) technique. The As-75-NMR results for the powder samples show that T-c increases up to 48 K without the influence of spin fluctuations. This fact indicates that spin fluctuations are not involved in raising T-c, which implies that other factors, such as orbital degrees of freedom, may be important for achieving a high T-c of almost 50 K.
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页数:4
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