2008/06/30 by Yunfeng Qiu, Y. Qiu, Wei Bao +16 · 2 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Corporate Taxation and Avoidance #Iron-based superconductors research #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.101.257002
published as Phys. Rev. Lett. 101, 257002 (2008) · 4 pages, 5 figures, 1 table. Identical to v3, correct HTML front matter; Scientific data and conclusions the same as in v2
arxiv created 2008/07/11 · openalex publication_date 2008/12/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The transition temperature TC approximately 26 K of the recently discovered superconductor LaFeAsO1-xFx is extremely sensitive to the lanthanide ion, reaching 55 K for the Sm containing oxypnictides. Therefore, it is important to determine how the moment on the lanthanide affects the overall magnetism in these systems. Here we report a neutron diffraction study of the Nd oxypnictides. Long-ranged antiferromagnetic order is apparent in NdFeAsO below 1.96 K. Rietveld refinement shows that both Fe and Nd magnetic ordering are required to describe the observed data with the staggered moment 1.55(4)microB/Nd and 0.9(1)microB/Fe at 0.3 K. The other structural properties such as the tetragonal-orthorhombic distortion are found to be very similar to those in LaFeAsO. Neither the magnetic ordering nor the structural distortion occur in the superconducting sample NdFeAsO0.80F0.20 at any temperatures down to 1.5 K.