Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.067008
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Funding
- NSF [DMR-0645305, DMR-0454672]
- DOE [DE-FG02-07ER46358, DE-FG02-08ER46544]
- NBRP of China [2006CB01003, 2009CB929104]
- PCSIRT of the MOE of China [IRT0754]
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Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (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) = (delta 01/2) for magnetic ordering in Fe1+yTe. A spin resonance with h Omega(0) = 6.51(4) meV approximate to 5.3k(B)T(c) and h Gamma = 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.
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