Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe0.4Te0.6

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yiming Qiu
  • Y. Zhao
  • Collin Broholm
  • V. Stanev
  • Z. Tesanovic
  • Y. C. Gasparovic
  • S. Chang
  • Jin Hu
  • Bin Qian
  • Minghu Fang
  • Zhiqiang Mao

Detail(s)

Original languageEnglish
Article number067008
Journal / PublicationPhysical Review Letters
Volume103
Issue number6
Online published7 Aug 2009
Publication statusPublished - 7 Aug 2009
Externally publishedYes

Abstract

Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (T= 14 K). Low energy spin fluctuations are found with a characteristic wave vector (½ ½ L) that corresponds to Fermi surface nesting and differs from Q= (δ0 ½) for magnetic ordering in Fe1+yTe. A spin resonance with h-Ω= 6.51(4) meV ≈ 5.3kBTc and h-Γ = 1.25(5) meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s± superconductivity and imperfect quasi-2D Fermi surface nesting.

Citation Format(s)

Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe0.4Te0.6. / Qiu, Yiming; Bao, Wei; Zhao, Y. et al.
In: Physical Review Letters, Vol. 103, No. 6, 067008, 07.08.2009.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review