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We have used polarized-neutron inelastic scattering to resolve the spinfluctuations in superconducting FeSe0.5Te0.5 into components parallel andperpendicular to the layers. A spin resonance at an energy of 6.5 meV isobserved to develop below T_c in both fluctuation components. The resonancepeak is anisotropic, with the in-plane component slightly larger than theout-of-plane component. Away from the resonance peak the magnetic fluctuationsare isotropic in the energy range studied. The results are consistent with adominant singlet pairing state with s^{\pm} symmetry, with a possible minoritycomponent of different symmetry.

Spin anisotropy of the resonance in superconducting FeSe0.5Te0.5