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Magnetic excitations in underdoped Ba(Fe 1-x Co x ) 2 As 2 with x=0.047
Tucker G.S.6; Fernandes R.M.1; Li H.-F.6; Thampy V.5; Ni N.6; Abernathy D.L.3; Bud'Ko S.L.6; Canfield P.C.6; Vaknin D.6; Schmalian J.2; McQueeney R.J.6
2012-07-06
Source PublicationPhysical Review B - Condensed Matter and Materials Physics
ISSN10980121 1550235X
Volume86Issue:2
AbstractThe magnetic excitations in the paramagnetic-tetragonal phase of underdoped Ba(Fe Co ) As , as measured by inelastic neutron scattering, can be well described by a phenomenological model with purely diffusive spin dynamics. At low energies, the spectrum around the magnetic ordering vector Q consists of a single peak with elliptical shape in momentum space. At high energies, this inelastic peak is split into two peaks across the direction perpendicular to Q . We use our fittings to argue that such a splitting is not due to incommensurability or propagating spin-wave excitations, but is rather a consequence of the anisotropies in the Landau damping and in the magnetic correlation length, both of which are allowed by the tetragonal symmetry of the system. We also measure the magnetic spectrum deep inside the magnetically ordered phase, and find that it is remarkably similar to the spectrum of the paramagnetic phase, revealing the strongly overdamped character of the magnetic excitations. © 2012 American Physical Society.
DOI10.1103/PhysRevB.86.024505
URLView the original
Language英語
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Cited Times [WOS]:29   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Columbia University in the City of New York
2.Karlsruhe Institute of Technology, Campus South
3.Oak Ridge National Laboratory
4.Los Alamos National Laboratory
5.Johns Hopkins University
6.Iowa State University
Recommended Citation
GB/T 7714
Tucker G.S.,Fernandes R.M.,Li H.-F.,et al. Magnetic excitations in underdoped Ba(Fe 1-x Co x ) 2 As 2 with x=0.047[J]. Physical Review B - Condensed Matter and Materials Physics,2012,86(2).
APA Tucker G.S..,Fernandes R.M..,Li H.-F..,Thampy V..,Ni N..,...&McQueeney R.J..(2012).Magnetic excitations in underdoped Ba(Fe 1-x Co x ) 2 As 2 with x=0.047.Physical Review B - Condensed Matter and Materials Physics,86(2).
MLA Tucker G.S.,et al."Magnetic excitations in underdoped Ba(Fe 1-x Co x ) 2 As 2 with x=0.047".Physical Review B - Condensed Matter and Materials Physics 86.2(2012).
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