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

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200 Scopus citations

Abstract

Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (Tc=14K). Low energy spin fluctuations are found with a characteristic wave vector (1212L) that corresponds to Fermi surface nesting and differs from Qm=(δ012) for magnetic ordering in Fe1+yTe. A spin resonance with Ω0=6.51(4)meV 5.3kBTc and 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 (US)
Article number067008
JournalPhysical review letters
Volume103
Issue number6
DOIs
StatePublished - Aug 7 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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