Incommensurate Spin-Density Wave Order in Electron-DopedBaFe2As2Superconductors

Autor:	G. S. Tucker, Alan I. Goldman, Jerel L. Zarestky, Y. B. Lee, Andreas Kreyssig, D. K. Pratt, Robert J. McQueeney, S.L. Bud'ko, B. N. Harmon, Wei Tian, P. C. Canfield, Alexander Thaler, M. G. Kim
Rok vydání:	2011
Předmět:	Superconductivity Physics Condensed matter physics Magnetism Neutron diffraction General Physics and Astronomy Antiferromagnetism Order (ring theory) Spin density wave Condensed Matter::Strongly Correlated Electrons Orthorhombic crystal system Fermi surface
Zdroj:	Physical Review Letters. 106
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.106.257001
Popis:	Neutron diffraction studies of $\mathrm{Ba}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{)}_{2}{\mathrm{As}}_{2}$ reveal that commensurate antiferromagnetic order gives way to incommensurate magnetic order for Co compositions between $0.056lxl0.06$. The incommensurability has the form of a small transverse splitting (0, $\ifmmode\pm\else\textpm\fi{}ϵ$, 0) from the commensurate antiferromagnetic propagation vector ${\mathbf{Q}}_{\mathrm{AFM}}=(1,0,1)$ (in orthorhombic notation) where $\mathbit{ϵ}\ensuremath{\approx}0.02\ensuremath{-}0.03$ 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.
Databáze:	OpenAIRE
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