Ferromagnetic spin fluctuation in LaFeAsO1-xFx

被引：46
|
作者：
Kohama, Yoshimitsu [1 ]
Kamihara, Yoichi [2 ]
Hirano, Masahiro [2 ]
Kawaji, Hitoshi [1 ]
Atake, Tooru [1 ]
Hosono, Hideo [1 ,2 ]
机构：
[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Tokyo Inst Technol, Japan Sci & Technol Agcy, Frontier Res Ctr, ERATO SORST,Midori Ku, Yokohama, Kanagawa 2268503, Japan
来源：
PHYSICAL REVIEW B | 2008年 / 78卷 / 02期
关键词：
D O I：
10.1103/PhysRevB.78.020512
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The F-doped LaFeAsO-a recently discovered superconductor with the high T(c) of 26 K-has been studied using the resistivity (rho), magnetic-susceptibility (chi), and heat-capacity (C(p)) measurements in the F doping range 0 <= x <= 0.14 (LaFeAsO(1-x)F(x)). In the low-temperature region, a T(3) ln T term in C(p) and a T(2) term in chi-which are derived from the spin fluctuation-are observed. The nearly ferromagnetic nature evidenced by a large Wilson ratio (6.5 for x=0 and 11.2 for x=0.025) suggests that the superconductivity in the LaFeAsO system is mediated by ferromagnetic spin fluctuation.
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页数：4
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