Magnetic order of the iron spins in NdFeAsO

Ying Chen, J. W. Lynn, J. Li, G. Li, G. F. Chen, J. L. Luo, N. L. Wang, Pengcheng Dai, C. dela Cruz, and H. A. Mook
Phys. Rev. B 78, 064515 – Published 21 August 2008

Abstract

Polarized and unpolarized neutron-diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdFeAsO. Antiferromagnetic order is observed below 141(6) K, which is in close proximity to the structural distortion observed in this material. The magnetic structure consists of chains of parallel spins that are arranged antiparallel between chains, which is the same in-plane spin arrangement as observed in all the other iron oxypnictide materials. Nearest-neighbor spins along the c axis are antiparallel like LaFeAsO. The ordered moment is 0.25(7)μB, which is the smallest moment found so far in these systems.

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  • Received 3 July 2008

DOI:https://doi.org/10.1103/PhysRevB.78.064515

©2008 American Physical Society

Authors & Affiliations

Ying Chen1,2, J. W. Lynn1, J. Li1,2, G. Li3, G. F. Chen3, J. L. Luo3, N. L. Wang3, Pengcheng Dai4,5, C. dela Cruz4,5, and H. A. Mook5

  • 1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
  • 2Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-6393, USA
  • 3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
  • 4Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
  • 5Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 78, Iss. 6 — 1 August 2008

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