Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System

Abstract

The transition temperature Tc~26 K of the recently discovered superconductor LaFeAs(O,F) has been demonstrated to be 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) Bohr magneton per Nd and 0.9(1) Bohr magneton per 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.

4 pages, 5 figures, 1 table. Identical to v3, correct HTML front matter; Scientific data and conclusions the same as in v2

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Cited by in corpus (15)

• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Iron pnictides as a new setting for quantum criticality
• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
• Valley density-wave and multiband superconductivity in Fe-pnictides
• Correlation effects in the iron pnictides
• Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)
• Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
• Proximity of LaOFeAs to a magnetic instability
• Electronic and lattice dynamical properties of the iron-based superconductors LiFeAs and NaFeAs
• Theoretical investigation of magnetic order in ReOFeAs, Re = Ce, Pr