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

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Q. Huang,¹ Y. Qiu,^1,2 Wei Bao,³ M. A. Green,^1,2 J. W. Lynn,¹ Y. C. Gasparovic,^1,2 T. Wu,⁴ G. Wu,⁴ and X. H. Chen⁴
¹NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
²Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
³Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁴Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

Received 14 July 2008; published 17 December 2008

Therecent discovery of superconductivity in (Ba,K)Fe₂As₂, which crystallizes in theThCr₂Si₂ (122) structure as compared with the LnFeAsO (Ln islanthanide) systems that possess the ZrCuSiAs (1111) structure, demonstrates theexciting potential of the FeAs-based materials for high-T_C superconductivity. Herewe report neutron diffraction studies that show a tetragonal-to-orthorhombic distortionassociated with the onset of q=(101) antiferromagnetic order in BaFe₂As₂,with a saturation moment 0.87(3)µ_B per Fe that is orientatedalong the longer a axis of the ab planes. Thesimultaneous first-order structural and magnetic transition is in contrast withthe separated transitions previously reported in the 1111-type materials. Theorientational relation between magnetic alignment and lattice distortion supports amultiorbital nature for the magnetic order.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.101.257003
DOI:	10.1103/PhysRevLett.101.257003
PACS:	74.25.Ha; 61.05.fm; 74.70.-b; 75.30.Fv 74.25.Ha Magnetic properties of superconductors 61.05.fm Neutron diffraction (condensed matter structure determination) 74.70.-b Superconducting materials 75.30.Fv Spin-density waves in magnetically ordered materials YEAR: 2008

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Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements
Y. Qiu, Wei Bao, Q. Huang et al.
Phys. Rev. Lett. 101, 257002 (2008)