Doping evolution of antiferromagnetic order and structural distortion in LaFeAsO1-xFx

被引：90

作者：

Huang, Q. ^{[1
]}

Zhao, Jun ^{[4
]}

Lynn, J. W. ^{[1
]}

Chen, G. F. ^{[2
]}

Luo, J. L. ^{[2
]}

Wang, N. L. ^{[2
]}

Dai, Pengcheng ^{[3
,4
]}

机构：

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

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100080, Peoples R China

[3] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[4] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.78.054529

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use neutron scattering to study the structural distortion and antiferromagnetic (AFM) order in LaFeAsO1-xFx as the system is doped with fluorine (F) to induce superconductivity. In the undoped state, LaFeAsO exhibits a structural distortion, changing the symmetry from tetragonal (space group P4/nmm) to orthorhombic (space group Cmma) at 155 K, and then followed by an AFM order at 137 K. Doping the system with F gradually decreases the structural distortion temperature, but suppresses the long range AFM order before the emergence of superconductivity. Therefore, while superconductivity in these Fe oxypnictides can survive in either the tetragonal or the orthorhombic crystal structure, it competes directly with static AFM order.

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