Incommensurate Spin-Density Wave Order in Electron-Doped BaFe2As2 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
DOI 10.1103/PhysRevLett.106.257001 · Physical Review Letters
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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, ±ϵ, 0) from the commensurate antiferromagnetic propagation vector QAFM=(1,0,1) (in orthorhombic notation) where ϵ≈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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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