RETRACTED: Systematic 75As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAsO1-xFx (Retracted article, see vol. 81, art. no. 019902, 2010)

被引：26

作者：

Nakai, Yusuke ^{[1
,2
]}

Kitagawa, Shunsaku ^{[1
,2
]}

Ishida, Kenji ^{[1
,2
]}

Kamihara, Yoichi ^{[2
]}

Hirano, Masahiro ^{[3
,4
]}

Hosono, Hideo ^{[3
,4
,5
]}

机构：

[1] Kyoto Univ, Dept Phys, Grad Sch Sci, Kyoto 6068502, Japan

[2] JST, TRIP, Chiyoda Ku, Tokyo 1020075, Japan

[3] Tokyo Inst Technol, JST, ERATO, SORST, Yokohama, Kanagawa 2268503, Japan

[4] Tokyo Inst Technol, Frontier Res Ctr, Yokohama, Kanagawa 2268503, Japan

[5] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 21期

关键词：

antiferromagnetic materials; doping; electrical resistivity; fluorine; iron compounds; lanthanum compounds; nuclear magnetic resonance; spin-lattice relaxation; superconducting energy gap; superconducting materials; SUPERCONDUCTOR; CU;

D O I：

10.1103/PhysRevB.79.212506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report As-75 NMR studies on LaFeAs(O1-xFx) (0 < x < 0.14). At x=0.04 near the phase boundary, from resistivity, spin-lattice relaxation rate 1/T-1, and NMR spectrum measurements, we found weak magnetic order at T-N similar or equal to 30 K. Antiferromagnetic (AFM) fluctuations proved through 1/T-1 are suppressed significantly with F doping, and pseudogap behavior without pronounced AFM fluctuations is observed at x=0.11 where T-C is maximum. This significant suppression of 1/T1T upon F doping while T-C remains nearly unchanged suggests that low-energy AFM fluctuations probed with As-75 NMR do not play a crucial role in the superconductivity.

引用

页数：4

共 29 条

[11] NMR measurements of intrinsic spin susceptibility in LaFeAsO0.9F0.1 [J].