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Neutrons have played an important role in advancing our understanding of thepairing mechanism and the symmetry of the superconducting energy gap in theiron arsenide compounds. Neutron measurements of the phonon density-of-stateare in good agreement with ab initio calculations, provided the magnetism ofthe iron atoms is taken into account. However, the predicted superconductingtransition temperatures are less than 1 K, making a conventional phononicmechanism for superconductivity highly unlikely. Measurements of the spindynamics within the spin density wave phase of the parent compounds showevidence of strongly dispersive spin waves with exchange interactionsconsistent with the observed magnetic order. Antiferromagnetic fluctuationspersist in the normal phase of the superconducting compounds, but they are morediffuse. Below Tc, there is evidence compounds that these fluctuations condenseinto a resonant spin excitation at the antiferromagnetic wavevector with anenergy that scales with Tc, consistent with unconventional superconductivity ofextended-s+/- wave symmetry.

Inelastic Neutron Scattering Studies of the Spin and Lattice Dynamics in Iron Arsenide Compounds