Unusual pressure effects on the superconductivity of indirectly electron-doped (Ba1-xLax)Fe2As2 epitaxial films

被引：13

作者：

Katase, Takayoshi ^{[1
]}

Sato, Hikaru ^{[2
]}

Hiramatsu, Hidenori ^{[2
,3
]}

Kamiya, Toshio ^{[2
,3
]}

Hosono, Hideo ^{[1
,2
,3
]}

机构：

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

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

[3] Tokyo Inst Technol, Mat Res Ctr Element Strategy, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 14期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevB.88.140503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Applying an external pressure to indirectly electron-doped 122-type (Ba1-xLax)Fe2As2 epitaxial films enhances the superconducting critical temperature (T-c) up to 30.3 K. Different from the other family compounds, the T-c is enhanced not only in the underdoped region but also in the optimally doped and overdoped regions. Narrowing of the superconducting transition width and an increase in the carrier density take place simultaneously in the whole doping region, except at the heavily overdoped limit. This characteristic is unique to and is observed only in (Ba1-xLax)Fe2As2, in which the La doping is stabilized via nonequilibrium growth of the vapor phase epitaxy, among the 122-type iron-based superconductors, AFe(2)As(2) (A = Ba, Sr, and Ca).

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页数：5

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