Incommensurate spin-density wave order in electron-doped BaFe 2As2 superconductors

D. K. Pratt, M. G. Kim, A. Kreyssig, Y. B. Lee, G. S. Tucker, A. Thaler, W. Tian, J. L. Zarestky, S. L. Bud'Ko, P. C. Canfield, B. N. Harmon, A. I. Goldman, R. J. McQueeney

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Abstract

Neutron diffraction studies of Ba(Fe1-xCox) 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, ±, 0) from the commensurate antiferromagnetic propagation vector QAFM=(1,0,1) (in orthorhombic notation) where 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.

Original languageEnglish
Article number257001
JournalPhysical Review Letters
Volume106
Issue number25
DOIs
StatePublished - Jun 20 2011
Externally publishedYes

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