Incommensurate Spin-Density Wave Order in Electron-Doped BaFe(2)As(2) Superconductors

TitleIncommensurate Spin-Density Wave Order in Electron-Doped BaFe(2)As(2) Superconductors
Publication TypeJournal Article
Year of Publication2011
AuthorsPratt DK, Kim MG, Kreyssig A, Lee YB, Tucker GS, Thaler A, Tian W, Zarestky JL, Bud'ko SL, Canfield PC, Harmon BN, Goldman AI, McQueeney RJ
Journal TitlePhysical Review Letters
Date Published06
ISBN Number0031-9007
Accession NumberWOS:000291801900011

Neutron diffraction studies of Ba(Fe(1-x)Co(x-2))As(2) 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, +/-epsilon, 0) from the commensurate antiferromagnetic propagation vector Q(AFM) = (1, 0, 1) (in orthorhombic notation) where epsilon approximate to 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.