Incommensurate spin-density wave order in electron-doped BaFe2As2 superconductors

Details Incommensurate spin-density wave order in electron-doped BaFe2As2 superconductors Incommensurate spin-density wave order in electron-doped BaFe2As2 superconductors

2011-04-05

arxiv.org/abs/1104.0717v1

Phys. Rev. Lett. 106, 257001 (2011)

Physics

Condensed Matter

Superconductivity

14 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.106.257001

Neutron diffraction studies of Ba(Fe[1-x]Co[x])2As2 reveal that commensurate antiferromagnetic order gives way to incommensurate magnetic order for Co compositions between 0.056 < x < 0.06. The incommensurability has the form of a small transverse splitting (0, +-e, 0) from the nominal commensurate antiferromagnetic propagation vector Q[AFM] = (1, 0, 1) (in orthorhombic notation) where e = 0.02-0.03 and is composition dependent. The results are consistent with the formation of a spin-density wave driven by Fermi surface nesting of electron and hole pockets and confirm the itinerant nature of magnetism in the iron arsenide superconductors.

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