Cobalt-Substitution-Induced Superconductivity in a New Compound with ZrCuSiAs-Type Structure, SrFeAsF

被引：58

作者：

Matsuishi, Satoru ^{[1
]}

Inoue, Yasunori ^{[2
]}

Nomura, Takatoshi ^{[2
]}

Hirano, Masahiro ^{[1
]}

Hosono, Hideo ^{[1
,2
]}

机构：

[1] Tokyo Inst Technol, Frontier Res Ctr, ERATO, SORST,JST,Midori Ku, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

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

关键词：

superconductivity; iron-based superconductor; ZrCuSiAs-type structure;

D O I：

10.1143/JPSJ.77.113709

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have synthesized a quaternary fluoroarsenide SrFeAsF with the ZrCuSiAs-type structure (P4/nmm, a = 0.3999 and c = 0.8973 nm), which is composed of an alternately stacked (FeAs)(delta-) and (SrF)(delta+) layers, analogous to the FeAs-based superconductor LaFeAsO. SrFeAsF shows metallic type conduction with the anomaly at similar to 180 K. The partial replacement of the Fe with Co suppresses the anomaly and induces the superconductivity, while the maximal T-c (4K for SrFe0.875Co0.125AsF) is much lower than that of the Co-substituted LaFeAsO. Replacement of (LaO)(delta+) layers with (SrF)(delta+) layers results in a enlargement of the c-axis length (+2.6%). These results suggest the importance of interlayer interaction as a critical T-c-controlling factor in FeAs-based superconductors.

引用

页数：7