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

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

*Corresponding author for this work

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

226 Citations (Scopus)

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.
Original languageEnglish
Article number067008
JournalPhysical Review Letters
Volume103
Issue number6
Online published7 Aug 2009
DOIs
Publication statusPublished - 7 Aug 2009
Externally publishedYes

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