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The recent observations of superconductivity at temperatures up to 55K incompounds containing layers of iron arsenide have revealed a new class of hightemperature superconductors that show striking similarities to the morefamiliar cuprates. In both series of compounds, the onset of superconductivityis associated with the suppression of magnetic order by doping holes and/orelectrons into the band leading to theories in which magnetic fluctuations areeither responsible for or strongly coupled to the superconducting orderparameter. In the cuprates, theories of magnetic pairing have been invoked toexplain the observation of a resonant magnetic excitation that scales in energywith the superconducting energy gap and is suppressed above the superconductingtransition temperature, Tc. Such resonant excitations have been shown byinelastic neutron scattering to be a universal feature of the cupratesuperconductors, and have even been observed in heavy fermion superconductorswith much lower transition temperatures. In this paper, we show neutronscattering evidence of a resonant excitation in Ba0.6K0.4Fe2As2, which is asuperconductor below 38K, at the momentum transfer associated with magneticorder in the undoped compound, BaFe2As2, and at an energy transfer that isconsistent with scaling in other strongly correlated electron superconductors.As in the cuprates, the peak disappears at Tc providing the first experimentalconfirmation of a strong coupling of the magnetic fluctuation spectrum to thesuperconducting order parameter in the new iron arsenide superconductors.

Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2