A Novel Large Moment Antiferromagnetic Order in K0.8Fe16Se2 Superconductor

被引：333

作者：

Bao Wei ^{[1
]}

Huang Qing-Zhen ^{[2
]}

Chen Gen-Fu ^{[1
]}

Green, M. A. ^{[2
,3
]}

Wang Du-Ming

He Jun-Bao

Qiu Yi-Ming ^{[2
,3
]}

机构：

[1] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

[2] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

CHINESE PHYSICS LETTERS | 2011年 / 28卷 / 08期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC ORDER;

D O I：

10.1088/0256-307X/28/8/086104

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The discovery of cuprate high T-C superconductors has inspired the search for unconventional superconductors in magnetic materials. A successful recipe has been to suppress long-range order in a magnetic parent compound by doping or high pressure to drive the material towards a quantum critical point. We report an exception to this rule in the recently discovered potassium iron selenide. The superconducting composition is identified as the iron vacancy ordered K0.83(2)Fe1.64(1)Se2 with T-C above 30K. A novel large moment 3.31 mu(B)/Fe antiferromagnetic order that conforms to the tetragonal crystal symmetry has an unprecedentedly high ordering temperature T-N approximate to 559 K for a bulk superconductor. Staggeringly polarized electronic density of states is thus suspected, which would stimulate further investigation into superconductivity in a strong spin-exchange field under new circumstances.

引用

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