Extreme sensitivity of superconductivity to stoichiometry in Fe1+δSe

被引：591

作者：

McQueen, T. M. ^{[1
]}

Huang, Q. ^{[2
]}

Ksenofontov, V. ^{[3
]}

Felser, C. ^{[3
]}

Xu, Q. ^{[4
]}

Zandbergen, H. ^{[4
]}

Hor, Y. S. ^{[1
]}

Allred, J. ^{[1
]}

Williams, A. J. ^{[1
]}

Qu, D. ^{[5
]}

Checkelsky, J. ^{[5
]}

Ong, N. P. ^{[5
]}

Cava, R. J. ^{[1
]}

机构：

[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[2] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Johannes Gutenberg Univ Mainz, Inst Anorgan Chem & Analyt Chem, D-55099 Mainz, Germany

[4] Delft Univ Technol, Dept Nanosci, Natl Ctr HREM, NL-2628 CJ Delft, Netherlands

[5] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 01期

基金：

美国国家科学基金会;

关键词：

iron compounds; proximity effect (superconductivity); stoichiometry; superconducting materials; FE-SE; SYSTEM;

D O I：

10.1103/PhysRevB.79.014522

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The recently discovered iron arsenide superconductors appear to display a universal set of characteristic features, including proximity to a magnetically ordered state and robustness of the superconductivity in the presence of disorder. Here we show that superconductivity in Fe1+delta Se, which can be considered the parent compound of the superconducting arsenide family, is destroyed by very small changes in stoichiometry. Further, we show that nonsuperconducting Fe1+delta Se is not magnetically ordered down to 5 K. These results suggest that robust superconductivity and immediate instability against an ordered magnetic state should not be considered as intrinsic characteristics of iron-based superconducting systems.

引用

页数：7

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