Magnetostriction and Magnetocaloric Properties of the Mn1 – xFexAs System

Abstract—The results of studying the temperature dependence of the magnetocaloric effect (ΔТad), thermal expansion and magnetostriction in the Mn1 – хFexAs (х = 0.003, 0.006) system in magnetic fields up to 8 T are presented. It is shown that an increase in the iron concentration in the Mn1 – xFexAs system leads to a shift in the phase transition temperature towards low temperatures by 15 K. In a field of 8 T, the value ΔTad = 8.3 K for the Mn0.997Fe0.003As sample at the initial temperature T0 = 318 K, and ΔTad = 7.7 K for Mn0.994Fe0.006As at T0 = 307 K. The data on thermal expansion and magnetostriction show that the magnetostriction decreases with increasing iron concentration, which also leads to a decrease in the magnetocaloric effect.