Publication: Doping dependence of spin dynamics in electron-doped Ba( Fe <inf>1-x</inf>Co<inf>x</inf>)2As<inf>2</inf>
Issued Date
2010-08-18
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ISSN
1550235X
10980121
10980121
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2-s2.0-77957369645
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Mahidol University
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SCOPUS
Bibliographic Citation
Physical Review B - Condensed Matter and Materials Physics. Vol.82, No.5 (2010)
Suggested Citation
K. Matan, S. Ibuka, R. Morinaga, Songxue Chi, J. W. Lynn, A. D. Christianson, M. D. Lumsden, T. J. Sato Doping dependence of spin dynamics in electron-doped Ba( Fe <inf>1-x</inf>Co<inf>x</inf>)2As<inf>2</inf>. Physical Review B - Condensed Matter and Materials Physics. Vol.82, No.5 (2010). doi:10.1103/PhysRevB.82.054515 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/29299
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Title
Doping dependence of spin dynamics in electron-doped Ba( Fe <inf>1-x</inf>Co<inf>x</inf>)2As<inf>2</inf>
Abstract
The spin dynamics in single crystal, electron-doped Ba( Fe 1-xCox)2As2 has been investigated by inelastic neutron scattering over the full range from undoped to the overdoped regime. We observe damped magnetic fluctuations in the normal state of the optimally doped compound (x=0.06) that share a remarkable similarity with those in the paramagnetic state of the parent compound (x=0). In the overdoped superconducting compound (x=0.14), magnetic excitations show a gaplike behavior, possibly related to a topological change in the hole Fermi surface (Lifshitz transition) while the imaginary part of the spin susceptibility χ″ prominently resembles that of the overdoped cuprates. For the heavily overdoped, nonsuperconducting compound (x=0.24) the magnetic scattering disappears, which could be attributed to the absence of a hole Fermi-surface pocket observed by photoemission. © 2010 The American Physical Society.