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.

引用

页数：4

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