Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO1-xFxFeAs

被引：1014

作者：

Chen, G. F. ^{[1
]}

Li, Z. ^{[1
]}

Wu, D. ^{[1
]}

Li, G. ^{[1
]}

Hu, W. Z. ^{[1
]}

Dong, J. ^{[1
]}

Zheng, P. ^{[1
]}

Luo, J. L. ^{[1
]}

Wang, N. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.100.247002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A series of layered CeO(1-x)F(x)FeAs compounds with x = 0 to 0.20 are synthesized by the solid state reaction method. Similar to the LaOFeAs, the pure CeOFeAs shows a strong resistivity anomaly near 145 K, which was ascribed to the spin-density-wave instability. F doping suppresses this instability and leads to the superconducting ground state. Most surprisingly, the superconducting transition temperature could reach as high as 41 K. Such a high T(c) strongly challenges the classic BCS theory based on the electron-phonon interaction. The closeness of the superconducting phase to the spin-density-wave instability suggests that the magnetic fluctuation plays a key role in the superconducting pairing mechanism. The study also reveals that the Ce 4f electrons form local moments and are ordered antiferromagnetically below 4 K, which could coexist with superconductivity.

引用

页数：4

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