This work investigates the magnetocaloric effect (MCE) in LaFeSi and LaFeMnSiH alloys under adiabatic ΔT and isothermal ΔQ conditions in a magnetic field of μH = 1.8 T. The studied samples exhibited high reproducibility of the ΔQ-effect upon cyclic magnetic field application, which is of critical importance for magnetic cooling systems.The LaFeMnSiH alloy demonstrate high values of the isothermal MCE, with a maximum ΔQ = 3400 J/kg in a magnetic field of μH = 1.8 T near the Curie temperature (T) of 275 K. This value is 2.5 times higher than the well-known corresponding values for pure Gd at room temperature. Furthermore, the structural and magnetic properties of LaFeSi-based alloys with Cr and Co additions were investigated using density functional theory calculations. It was shown that the addition of Cr leads to a decrease in the equilibrium volume, i. e., to a compression of the crystal lattice, whereas Co addition causes its expansion. These changes are expected to increase or decrease the T, respectively.
Kamantsev et al. (Wed,) studied this question.