Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe2As2 Compound of FeAs-Based High-Temperature Superconductors

被引：718
作者：
Huang, Q. [1 ]
Qiu, Y. [1 ,2 ]
Bao, Wei [3 ]
Green, M. A. [1 ,2 ]
Lynn, J. W. [1 ]
Gasparovic, Y. C. [1 ,2 ]
Wu, T. [4 ,5 ]
Wu, G. [4 ,5 ]
Chen, X. H. [4 ,5 ]
机构：
[1] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[4] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[5] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 25期
关键词：
D O I：
10.1103/PhysRevLett.101.257003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The recent discovery of superconductivity in (Ba,K)Fe2As2, which crystallizes in the ThCr2Si2 (122) structure as compared with the LnFeAsO (Ln is lanthanide) systems that possess the ZrCuSiAs (1111) structure, demonstrates the exciting potential of the FeAs-based materials for high-T-C superconductivity. Here we report neutron diffraction studies that show a tetragonal-to-orthorhombic distortion associated with the onset of q=(101) antiferromagnetic order in BaFe2As2, with a saturation moment 0.87(3)mu(B) per Fe that is orientated along the longer a axis of the ab planes. The simultaneous first-order structural and magnetic transition is in contrast with the separated transitions previously reported in the 1111-type materials. The orientational relation between magnetic alignment and lattice distortion supports a multiorbital nature for the magnetic order.
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页数：4
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