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We present a detailed study of structural, magnetic and thermodynamicproperties of a series of Heusler alloys Fe2-xMnxCrAl (x=0, 0.25, 0.5, 0.75 and1). Structural investigation of this series is carried out using highresolution synchrotron X-ray diffraction. Results suggest that with increasingMn concentration, the L21 structure of Fe2CrAl is destabilized. The DCmagnetization results show a decrement in paramagnetic (PM) to ferromagnetic(FM) phase transition temperature (TC) with increasing Mn concentration. Fromthe systematic analysis of magnetic memory effect, heat capacity, timedependent magnetization, and DC field dependent AC susceptibility studies it isobserved that, Fe2CrAl exhibits cluster glass(CG)-like transition approximatelyat 3.9 K (Tf2). The alloys, Fe1.75Mn0.25CrAl and Fe1.5Mn0.5CrAl exhibit doubleCG-like transitions near Tf1~22 K, Tf2~4.2 K and Tf1~30.4 K, Tf2~9.5 Krespectively, however, in Fe1.25Mn0.75CrAl, a single CG-like transition isnoted at Tf2~11.5 K below TC. Interestingly, FeMnCrAl shows the absence of longranged magnetic ordering and this alloy undergoes three CG-like transitions at~ 22 K (Tf*), 16.6 K (Tf1) and 11 K (Tf2). At high temperatures, a detailedanalysis of temperature response of inverse DC susceptibility clearly revealsthe observation of Griffiths phase (GP) above 300 K (T*) in Fe2CrAl and thisphase persists with Mn concentration with a decrement in T*.

Exotic magnetic behaviour and evidence of cluster glass and Griffiths like phase in Heusler alloys Fe2-xMnxCrAl