Superconductivity of LaFeAsO1-xFx under high pressure studied using NMR

被引：0
|
作者：
Fujiwara, Naoki [1 ]
Nakano, Tatsuya [1 ]
Tatsumi, Kenichiro [1 ]
Okada, Hironari [2 ]
Takahashi, Hiroki [2 ]
Kamihara, Yoichi [3 ]
Hirano, Masahiro [4 ]
Hosono, Hideo [4 ]
机构：
[1] Kyoto Univ, Grad Sch Human & Environm Studies, Sakyo Ku, Kyoto 6068501, Japan
[2] Nihon Univ, Coll Humanities & Sci, Dept Phys, Setagaya Ku, Tokyo 1568550, Japan
[3] Tokyo Inst Technol, Frontier Res Ctr, JST, ERATO SORST, Yokohama, Kanagawa 2268503, Japan
[4] Tokyo Inst Technol, Frontier Res Ctr, Midori Ku, Yokohama, Kanagawa 2268503, Japan
来源：
INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) | 2010年 / 200卷
关键词：
D O I：
10.1088/1742-6596/200/1/012042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nuclear magnetic resonance (NMR) on an iron (Fe)-based superconductor LaFeAsO1-xFx (x = 0.08 and 0.14) was performed at ambient pressure and under pressure. The relaxation rate 1/T-1 for x = 0.14 shows T-linear behavior just above T-c, and pressure application enhances 1/T1T similar to T-c. This fact implies that 1/T1T = constant originates from Korringa relation and an increase in the density of state at the Fermi energy D(E-F) leads to the enhancement of T-c. In the case of x - 0.08, 1/T-1 measured at ambient pressure also shows T-linear behavior in a wide temperature range above T. The value of 1/T1T is enhanced compared to the x = 0.14 doped sample, although their T-c values are in the same range. The enhancement of 1/T1T for x = 0.08 is attributable to antiferromagnetic fluctuation rather than an increase in D(E-F).
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页数：4
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