Water-induced superconductivity in SrFe2As2

被引：61

作者：

Hiramatsu, Hidenori ^{[1
]}

Katase, Takayoshi ^{[2
]}

Kamiya, Toshio ^{[1
,2
]}

Hirano, Masahiro ^{[1
]}

Hosono, Hideo ^{[1
,2
]}

机构：

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

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

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 05期

关键词：

high-temperature superconductors; iron compounds; magnetic anisotropy; stoichiometry; strontium compounds; superconducting thin films; superconducting transition temperature; superconducting transitions; AUGMENTED-WAVE METHOD;

D O I：

10.1103/PhysRevB.80.052501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It has been considered that FeAs-based high-transition temperature (high-T-c) superconductors need electron or hole doping by aliovalent-ion substitution or large off stoichiometry in order to induce superconductivity. We report that exposure of undoped SrFe2As2 epitaxial thin films to water vapor induces a superconducting transition. These films exhibit a higher onset T-c (25 K) and larger magnetic field anisotropy than those of cobalt-doped SrFe2As2 epitaxial films, suggesting that the mechanism for the observed superconducting transition differs from that of the aliovalent-ion-doped SrFe2As2. The present finding provides an interesting approach to induce superconductivity with a higher T-c in FeAs-based superconductors.

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页数：4

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