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 (½ ½ L) that corresponds to Fermi surface nesting and differs from Qm = (δ0 ½) for magnetic ordering in Fe1+yTe. A spin resonance with h-Ω0 = 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 language | English |
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Article number | 067008 |
Journal | Physical Review Letters |
Volume | 103 |
Issue number | 6 |
Online published | 7 Aug 2009 |
DOIs | |
Publication status | Published - 7 Aug 2009 |
Externally published | Yes |
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Dive into the research topics of 'Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe0.4Te0.6'. Together they form a unique fingerprint.Prizes
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ESI Highly Cited Papers in the top 1% of the academic field of Physics
BAO, W. (Recipient), 2019
Prize: 64B_Prizes and awards
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