Doping dependence of spin dynamics in electron-doped Ba( Fe 1-xCox)2As2

K. Matan, S. Ibuka, R. Morinaga, Songxue Chi, J. W. Lynn, A. D. Christianson, M. D. Lumsden, T. J. Sato

研究成果: Article査読

40 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号054515
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
82
5
DOI
出版ステータスPublished - 2010 8 18
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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