Abstract
Polycrystalline Mn4.5Ni0.5Sn3 alloy has been prepared using arc melting technique. Its crystal structure is found to be of hexagonal Ni2In-type (space group = P63/mmc). The alloy undergoes a ferromagnetic transition of second order at TC = 180 K. Mn4.5Ni0.5Sn3 alloy is a moderate heavy fermion and exhibits bad metallic nature as a consequence of strong impurity scattering. From the critical analysis, the presence of a long range interaction in the alloy is well established as the critical exponents' values are close to the theoretical values of the mean field model. Further magnetocaloric studies reveal a maximum magnetic entropy change of 1.87 J/kg K with a wide working span, ΔT = 86 K, yielding a relative cooling power of 160 J/kg for a field change of 0–5 T.
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