Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements

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Y. Qiu,^1,2 Wei Bao,³ Q. Huang,¹ T. Yildirim,¹ J. M. Simmons,^1,2 M. A. Green,^1,2 J. W. Lynn,¹ Y. C. Gasparovic,^1,2 J. Li,^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 8 July 2008; published 17 December 2008

Thetransition temperature T_C [approximate] 26 K of the recently discovered superconductor LaFeAsO_1-xF_x isextremely sensitive to the lanthanide ion, reaching 55 K for theSm containing oxypnictides. Therefore, it is important to determine howthe moment on the lanthanide affects the overall magnetism inthese systems. Here we report a neutron diffraction study ofthe Nd oxypnictides. Long-ranged antiferromagnetic order is apparent in NdFeAsObelow 1.96 K. Rietveld refinement shows that both Fe and Ndmagnetic ordering are required to describe the observed data withthe staggered moment 1.55(4)µ_B/Nd and 0.9(1)µ_B/Fe at 0.3 K. The otherstructural properties such as the tetragonal-orthorhombic distortion are found tobe very similar to those in LaFeAsO. Neither the magneticordering nor the structural distortion occur in the superconducting sampleNdFeAsO_0.80F_0.20 at any temperatures down to 1.5 K.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.101.257002
DOI:	10.1103/PhysRevLett.101.257002
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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Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe₂As₂ Compound of FeAs-Based High-Temperature Superconductors
Q. Huang, Y. Qiu, Wei Bao et al.
Phys. Rev. Lett. 101, 257003 (2008)