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Heusler alloy Fe2CrAl exhibits a ferromagnetic behaviour below Curietemperature (TC) ~ 202 K along with presence of cluster glass (CG) phase nearfreezing temperature (Tf) ~ 3.9 K and Griffiths phase (GP) above 300 K. Thephysical properties of this alloy are very sensitive to substitutions andanti-site disorder. Here, we investigate the effect of partial substitution ofMo at Cr-site on physical properties of Fe2CrAl. Structural and morphologicalanalysis confirms the single cubic structure of the substituted alloys.Increment in Mo concentration shifts the TC towards lower temperature, which isascribed to the effect of increased hybridization strength between 3d-4d statesof Fe/Cr/Mo. Additionally, systematic analysis of AC susceptibility, magneticmemory effect and time dependent magnetization studies confirm the presence ofCG-like phase near (Tf) ~ 3.5 K in Fe2Cr0.95Mo0.05Al. Such feature getssuppressed towards lower temperature with an increase of Mo concentration, i.e.below 1.8 K in Fe2Cr0.85Mo0.15Al. The origin of the glassy signature isascribed to the decrement in magnetic anisotropy with Mo concentration. Apartial increment in magnetic entropy change is also noted near TC with theincrease in Mo substitution. Interestingly, at high temperatures (above 350 K),GP phase persists in both the alloys due to the presence of anti-site disorder.

Effect of partial substitution of iso-valent Mo at Cr-site on electronic structure and physical properties of Fe2CrAl