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

被引：722

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.

引用

页数：4

共 33 条

[1] Dramatic switching of magnetic exchange in a classic transition metal oxide: Evidence for orbital ordering [J].

Bao, W ;

Broholm, C ;

Aeppli, G ;

Dai, P ;

Honig, JM ;

Metcalf, P .

PHYSICAL REVIEW LETTERS, 1997, 78 (03) :507-510

[2] High pressure synthesis of late rare earth RFeAs(O,F) superconductors; R = Tb and Dy [J].

Bos, Jan-Willem G. ;

Penny, George B. S. ;

Rodgers, Jennifer A. ;

Sokolov, Dmitry A. ;

Huxley, Andrew D. ;

Attfield, J. Paul .

CHEMICAL COMMUNICATIONS, 2008, (31) :3634-3635

[3] Proximity of antiferromagnetism and superconductivity in LaFeAsO1-xFx:: Effective Hamiltonian from ab initio studies [J].

Cao, Chao ;

Hirschfeld, P. J. ;

Cheng, Hai-Ping .

PHYSICAL REVIEW B, 2008, 77 (22)

[4] Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO1-xFxFeAs [J].

Chen, G. F. ;

Li, Z. ;

Wu, D. ;

Li, G. ;

Hu, W. Z. ;

Dong, J. ;

Zheng, P. ;

Luo, J. L. ;

Wang, N. L. .

PHYSICAL REVIEW LETTERS, 2008, 100 (24)

[5]

Chen GF, 2008, CHINESE PHYS LETT, V25, P3403, DOI 10.1088/0256-307X/25/9/083

[6]

Chen GF, 2008, CHINESE PHYS LETT, V25, P2235, DOI 10.1088/0256-307X/25/6/086

[7] Superconductivity at 43 K in SmFeAsO1-xFx [J].

Chen, X. H. ;

Wu, T. ;

Wu, G. ;

Liu, R. H. ;

Chen, H. ;

Fang, D. F. .

NATURE, 2008, 453 (7196) :761-762

[8] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[9] Competing orders and spin-density-wave instability in La(O1-xFx) FeAs [J].

Dong, J. ;

Zhang, H. J. ;

Xu, G. ;

Li, Z. ;

Li, G. ;

Hu, W. Z. ;

Wu, D. ;

Chen, G. F. ;

Dai, X. ;

Luo, J. L. ;

Fang, Z. ;

Wang, N. L. .

EPL, 2008, 83 (02)

[10] Correlated electronic structure of LaO1-xFxFeAs [J].

Haule, K. ;

Shim, J. H. ;

Kotliar, G. .

PHYSICAL REVIEW LETTERS, 2008, 100 (22)

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