Evidence for Unconventional Superconductivity in Arsenic-Free Iron-Based Superconductor FeSe: A 77Se-NMR Study

被引：80

作者：

Kotegawa, Hisashi ^{[1
]}

Masaki, Satoru ^{[1
]}

Awai, Yoshiki ^{[1
]}

Tou, Hideki ^{[1
]}

Mizuguchi, Yoshikazu ^{[2
]}

Takano, Yoshihiko ^{[2
]}

机构：

[1] Kobe Univ, Dept Phys, Kobe, Hyogo 6588530, Japan

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 11期

关键词：

FeSe; superconductivity; NMR;

D O I：

10.1143/JPSJ.77.113703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the results of Se-77-nuclear magnetic resonance (NMR) in alpha-FeSe, which exhibits a similar crystal structure to the LaFeAsO1-xFx superconductor and shows superconductivity at 8 K. The nuclear-spin lattice relaxation rate 1/T-1 shows T-3 behavior below the superconducting transition temperature T-c without a coherence peak. The T1T = const. behavior, indicative of the Fermi liquid state, can be seen in a wide temperature range above T-c. The superconductivity in alpha-FeSe is also an unconventional one as well as LaFeAsO1-xFx and related materials. The FeAs layer is not essential for the occurrence of the unconventional superconductivity.

引用

页数：4

共 24 条

[1] Superconductivity at 43 K in SmFeAsO1-xFx [J].