Magnetic Order of the Iron Spins in NdOFeAs

Abstract

Polarized and unpolarized neutron diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdOFeAs. 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 LaOFeAs. The ordered moment is 0.25(7) muB, which is the smallest moment found so far in these systems.

7 pages, 4 figures

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• Doping evoluton of antiferromagnetic order and structural distortion in LaFeAsO${}_{1-x}$F${}_x$
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• Magnetic Ordering and Negative Thermal Expansion in PrFeAsO
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• The magnetic moment enigma in Fe-based high temperature superconductors
• Temperature dependence and resonance effects in Raman scattering of phonons in NdFeAsO${}_x$F${}_{1-x}$ single crystals
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• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• Impurity states in antiferromagnetic Iron Arsenides
• Anisotropic Thermal Transport in Superconductors with Coexisting Spin Density Waves