  Fe doped Ni$_2$Mn$_{1.5}$In$_{0.5}$, particularly,
Ni$_2$Mn$_{1.4}$Fe$_{0.1}$In$_{0.5}$, despite having an incommensurate,
modulated 7M martensitic structure at room temperature exhibits frequency
dependent behavior of storage modulus and loss that obeys Vogel-Fulcher law as
well as shows ergodicity breaking between zero field cooled and field cooled
strain measurements just above the transition temperature. Both, frequency
dependence and ergodicity breaking are characteristics of a strain glassy phase
and occur due to presence of strain domains which are large enough to present
signatures of long range martensitic order in diffraction but are non
interacting with other strain domains due to presence of Fe impurity.
