Spin Gap and Resonance at the Nesting Wave Vector in SuperconductingFeSe0.4Te0.6

2009/05/21 by Yiming Qiu, Wei Bao, Yusheng Zhao +14 · 224 citations
Materials Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Fermi surface #Iron-based superconductors research #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Resonance (particle physics) #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.103.067008

published in Physical Review Letters 103(6), 067008 (American Physical Society) · 4 pages, 4 figures, Submitted to Phys. Rev. Lett

arxiv created 2009/05/21 · openalex publication_date 2009/08/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Neutron scattering is used to probe magnetic excitations in FeSe_0.4Te_0.6 (T_c=14 K). Low energy spin fluctuations are found with a characteristic wave vector ((1)/(2)(1)/(2)L) that corresponds to Fermi surface nesting and differs from Q_m=(\ensuremathδ0(1)/(2)) for magnetic ordering in Fe_1+yTe. A spin resonance with \ensuremathℏ\ensuremathΩ₀=6.51(4) meV\ensuremath≈5.3k_BT_c and \ensuremathℏ\ensuremathΓ=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_\ifmmode±\else\textpm\fi superconductivity and imperfect quasi-2D Fermi surface nesting.

Citations

• Iron-based layered compound LaFeAsO is an antiferromagnetic semimetal
• Superconducting Fe-Based Compounds(A1−xSrx)Fe2As2withA=Kand Cs with Transition Temperatures up to 37 K
• Two-dimensional resonant magnetic excitation inBaFe1.84Co0.16As2
• Competing orders and spin-density-wave instability in La(O 1−x F x )FeAs
• Transport properties and superconductivity in Ba 1-x M x Fe 2 As 2 (M=La and K) with double FeAs layers
• Spin Resonance in thed-Wave SuperconductorCeCoIn5
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• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An intrinsic FeAs-based superconductor withTc=18 K
• Theory of magnetic excitations in iron-based layered superconductors
• The resonant magnetic mode: A common feature of high-Tc superconductors
• Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2

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