Pressure-induced superconductivity in LaFeAsO: The role of anionic height and magnetic ordering

被引：9

作者：

Kumar, Ravhi S. ^{[1
]}

Hamlin, James J. ^{[2
,3
]}

Maple, M. Brian ^{[2
]}

Zhang, Yi ^{[1
]}

Chen, Changfeng ^{[1
]}

Baker, Jason ^{[1
]}

Cornelius, Andrew L. ^{[1
]}

Zhao, Yusheng ^{[1
]}

Xiao, Yuming ^{[4
]}

Sinogeikin, Stanislav ^{[4
]}

Chow, Paul ^{[4
]}

机构：

[1] Univ Nevada, Dept Phys & Astron & HiPSEC, Las Vegas, NV 89154 USA

[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92903 USA

[3] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[4] Carnegie Inst Sci, Geophys Lab, HPCAT, Argonne, IL 60439 USA

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 25期

关键词：

43; K; T-C; IRON; DEPENDENCE;

D O I：

10.1063/1.4904954

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the crystal structure and magnetic ordering of LaFeAsO at low temperature (similar to 10 K) and high pressures. The long range antiferromagnetic ordering is suppressed under pressure, and the structural parameters obtained show a close correlation between the anionic height (h(a)) and the transition temperature (T-c). An orthorhombic to tetragonal transition is observed above 30 GPa. Density functional theory calculations show that the shape of the hole surface becomes two dimensional under pressure. Our results demonstrate that the variation of h(a) and dimensionality play important roles in the evolution of pressure induced superconductivity in addition to magnetic ordering. (C) 2014 AIP Publishing LLC.

引用

页数：5

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