  In several members of the pnictide materials, spin density wave order
coexists with superconductivity over a range of dopings and temperature. In
this paper we show that odd-frequency superconductivity emerges on the edges of
pnictides in such a coexistence phase. In particular, the breaking of
spin-rotation symmetry by SDW and translation symmetry by the edge can lead to
the development of odd-frequency spin-triplet Cooper pairing on edges of
superconducting pnictide samples. In this case, the odd-frequency pairing has
even parity components, which are immune to disorder. Our results show that
pnictides are a natural platform to realize odd frequency superconductivity,
which is a new quantum phase and has been mainly searched for in
heterostructures of magnetic and superconducting materials. The emergence of
odd-frequency pairing on the edges and in the defects can be potentially
detected in magnetic response measurements.
