Crystal Structure and Antiferromagnetic Order in NdFeAsO1-xFx (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements

Y. Qiu; Wei Bao; Q. Huang; T. Yildirim; J. M. Simmons; M. A. Green; J. W. Lynn; Y. C. Gasparovic; J. Li; T. Wu; G. Wu; X. H. Chen

doi:10.1103/PhysRevLett.101.257002

Author(s)

Y. Qiu
Q. Huang
T. Yildirim
J. M. Simmons
M. A. Green
J. W. Lynn
Y. C. Gasparovic
J. Li
T. Wu
G. Wu
X. H. Chen

Detail(s)

Original language	English
Article number	257002
Journal / Publication	Physical Review Letters
Volume	101
Issue number	25
Online published	17 Dec 2008
Publication status	Published - 19 Dec 2008
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1103/PhysRevLett.101.257002 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-58049092261&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(8de8b9d7-bdcb-44bc-bcd9-3ada759a7abc).html

Abstract

The transition temperature T_C≈ 26 K of the recently discovered superconductor LaFeAsO_1-xF_x 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)μ_B/Nd and 0.9(1)μ_B/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 NdFeAsO_0.80F_0.20 at any temperatures down to 1.5 K.

Citation Format(s)

[ RIS ] [ BibTeX ]

Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements. / Qiu, Y.; Bao, Wei; Huang, Q. et al.
In: Physical Review Letters, Vol. 101, No. 25, 257002, 19.12.2008.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Qiu, Y, Bao, W, Huang, Q, Yildirim, T, Simmons, JM, Green, MA, Lynn, JW, Gasparovic, YC, Li, J, Wu, T, Wu, G & Chen, XH 2008, 'Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements', Physical Review Letters, vol. 101, no. 25, 257002. https://doi.org/10.1103/PhysRevLett.101.257002

Qiu, Y., Bao, W., Huang, Q., Yildirim, T., Simmons, J. M., Green, M. A., Lynn, J. W., Gasparovic, Y. C., Li, J., Wu, T., Wu, G., & Chen, X. H. (2008). Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements. Physical Review Letters, 101(25), Article 257002. https://doi.org/10.1103/PhysRevLett.101.257002

Qiu Y, Bao W, Huang Q, Yildirim T, Simmons JM, Green MA et al. Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements. Physical Review Letters. 2008 Dec 19;101(25):257002. Epub 2008 Dec 17. doi: 10.1103/PhysRevLett.101.257002

Qiu, Y. ; Bao, Wei ; Huang, Q. et al. / Crystal Structure and Antiferromagnetic Order in NdFeAsO_1-xF_x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements. In: Physical Review Letters. 2008 ; Vol. 101, No. 25.