Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2

被引：2709

作者：

Rotter, Marianne ^{[1
]}

Tegel, Marcus ^{[1
]}

Johrendt, Dirk ^{[1
]}

机构：

[1] Univ Munich, Dept Chem & Biochem, D-81377 Munich, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.101.107006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ternary iron arsenide BaFe2As2 becomes superconducting by hole doping, which was achieved by partial substitution of the barium site with potassium. We have discovered bulk superconductivity at T-c = 38 K in (Ba1-xKx)Fe2As2 with x approximate to 0.4. The parent compound BaFe2As2 crystallizes in the tetragonal ThCr2Si2-type structure, which consists of (FeAs)(delta-) iron arsenide layers separated by Ba2+ ions. BaFe2As2 is a poor metal and exhibits a spin density wave anomaly at 140 K. By substituting Ba2+ for K+ ions we have introduced holes in the (FeAs)(-) layers, which suppress the anomaly and induce superconductivity. The T-c of 38 K in (Ba0.6K0.4)Fe2As2 is the highest in hole doped iron arsenide superconductors so far. Therefore, we were able to expand this class of superconductors by oxygen-free compounds with the ThCr2Si2-type structure.

引用

页数：4

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