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 language | English |
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Article number | 257001 |
Journal | Physical Review Letters |
Volume | 106 |
Issue number | 25 |
DOIs | |
State | Published - Jun 20 2011 |
Externally published | Yes |