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Successive magnetic transitions with large refrigerant capacity in arc-melted Mn3−xFexSn2 (x = 0.3, 0.7) alloys
Journal of Magnetism and Magnetic Materials  (IF2.993),  Pub Date : 2021-08-30, DOI: 10.1016/j.jmmm.2021.168466
Sonam Perween, Lalita, A. Rathi, R.P. Pant, B. Gahtori, P.D. Babu, G.A. Basheed

This work investigates the magneto-caloric effect and critical behavior in Mn${}_{3-x}$Fe${}_{x}$Sn2 ($x$ = 0.3, 0.7) alloys synthesized by arc melting method. The alloys show two successive second order magnetic phase transitions at T${}_{C1}$ $\approx$ 254 K (261 K) and T${}_{C2}$ $\approx$ 205 K (185 K), respectively for $x$ = 0.3 (0.7). The modified Arrot plot study around paramagnetic–ferromagnetic transition at T${}_{C1}$ reveals the critical exponent, $\beta$ = 0.397 (0.378) with long-range of magnetic interactions for $x$ = 0.3 (0.7). Importantly, the magneto-caloric study for $x$ = 0.3 (0.7) gives large refrigerant capacity (RC) of 330 (250) J/kg at 5 T applied magnetic field. The large RC value and two successive magnetic transitions makes these earth abundant-based Mn${}_{3-x}$Fe${}_{x}$Sn2 alloys highly promising for magnetic refrigeration in a wide temperature span.