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Martensitic transition temperature steadily decreases inNi$_{2-x}$Fe$_{x}$Mn$_{1.5}$In$_{0.5}$ and is completely suppressed at $x$ =0.2. Despite suppression of martensitic transition,Ni$_{1.8}$Fe$_{0.2}$Mn$_{1.5}$In$_{0.5}$ does not display the expected strainglassy phase. Instead, a ground state with dominant ferromagnetic interactionsis observed. A study of structural and magnetic properties of $x$ = 0.2 revealthat the alloy consists of a major Fe rich cubic phase and a minor Fe deficientmonoclinic phase favoring a ferromagnetic ground state. This is exactlyopposite of that observed in Ni$_2$Mn$_{1-y}$Fe$_{y}$In$_{0.5}$ wherein astrain glassy phase is observed for $y$ = 0.1. The change in site symmetry ofFe when doped for Ni in contrast to Mn in the Heusler composition seems tosupport the growth of the ferromagnetic phase.

Importance of site occupancy and absence of strain glassy phase in Ni$_{2-x}$Fe$_{x}$Mn$_{1.5}$In$_{0.5}$