Incommensurate Spin-Density Wave Order in Electron-Doped BaFe(2)As(2) Superconductors
|Title||Incommensurate Spin-Density Wave Order in Electron-Doped BaFe(2)As(2) Superconductors|
|Publication Type||Journal Article|
|Year of Publication||2011|
|Authors||Pratt 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 Title||Physical Review Letters|
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.