Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6

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Title: Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6
Author: Qiu, Yiming; Bao, Wei; Zhao, Y.; Broholm, C.; Stanev, V.; Tesanovic, Z.; Gasparovic, Y.C.; Chang, S.; Hu, Jin; Qian, Bin; Fang, Minghu; Mao, Zhiqiang
Abstract: Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (Tc = 14 K). 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 ℎΩ0 = 6.51(4) meV ≈ 5.3kBTc and ℎΓ = 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.
URI: http://jhir.library.jhu.edu/handle/1774.2/33732
Date: 2009-08-07
Citation: Source: Physical Review Letters 7 Aug. 2009, vol.103, no.6, 067008 (4 pp.
Subject: spin resonance
spin gap
nesting wave vector
tellurium alloys
selenium alloys
probe magnetic excitations
low energy spin fluctuations
magnetic ordering
normal state continuum
neutron diffraction
iron alloys
Fermi surface
bound states
imperfect quasi 2D Fermi surface nesting
superconductivity
FeSe0.4Te0.6Jk

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