Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe0.6Se0.4 superconductor

D. N. Argyriou, A. Hiess, A. Akbari, I. Eremin, M. M. Korshunov, Jin Hu, Bin Qian, Zhiqiang Mao, Yiming Qiu, Collin Broholm, W. Bao

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Abstract

We report on inelastic neutron-scattering measurements that find itinerantlike incommensurate magnetic excitations in the normal state of superconducting FeTe0.6Se0.4 (Tc =14 K) at wave vector Qinc = (1/2±, ε 1/2 ε) with ε=0.09 (1). In the superconducting state only the lower energy part of the spectrum shows significant changes by the formation of a gap and a magnetic resonance that follows the dispersion of the normal-state excitations. We use a four band model to describe the Fermi-surface topology of this iron-based superconductors with the extended s (±) symmetry and find that it qualitatively captures the salient features of these data.

Original languageEnglish (US)
Article number220503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number22
DOIs
Publication statusPublished - Jun 14 2010

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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