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Ni$_2$Mn$_{2-y}$In$_y$ alloys transform from the martensitic $L1_0$antiferromagnetic ground state near $y = 0$ to austenitic ferromagnetic $L2_1$Heusler phase near $y = 1$ due to doping of In impurity for Mn. The offstoichiometric alloys prepared by rapid quenching are structurally metastableand dissociate into a mixture of $L2_1$ (Ni$_2$MnIn) and $L1_0$ (NiMn) phasesupon temper annealing. Despite this structural disintegration, the martensitictransformation temperature remains invariant in the temper annealed alloys.Investigations of the local structure of the constituent atoms reveal thepresence of strongly coupled Ni$_2$MnIn and NiMn structural units in the temperannealed as well as the rapidly quenched off stoichiometricNi$_2$Mn$_{2-y}$In$_y$ alloys irrespective of their crystal structure. Thisrandom packing of the $L2_1$ and $L1_0$ structural units seems to beresponsible for invariance of martensitic transition temperature in the temperannealed alloys as well as the absence of strain glass transition in rapidlyquenched alloys.

Randomly packed Ni$_2$MnIn and NiMn structural units in off stoichiometric Ni$_2$Mn$_{2-y}$In$_y$ alloys