Study of magnetic, structural and magnetocaloric properties of La0.6Pr0.4Mn2Si2 under high pressures and magnetic field

Abstract The structural, magnetic and magnetocaloric properties of La 0.6 Pr 0.4 Mn 2 Si 2 compound were measured in wide range of temperature, magnetic field and hydrostatic pressure. The structural study up to 10 GPa confirmed the existence of critical Mn-Mn distance 0.2883 nm for the ferromagnetic to antiferromagnetic transition at room temperature. The results demonstrated the crucial role of the volume in the suppression of the ferromagnetic phase above the transition temperature T 1 =168 K under pressure. The huge pressure shift of the transition temperature T 1 , dT 1 /dp=230 K/GPa, was observed. Based on our magnetization measurement the low temperature transition at T 2 =30 K is connected with reorientation of Mn moment and the rare-earth sublattice is not ordered in this case. The direct magnetocaloric measurement showed moderate values of the adiabatic temperature change connected with the magnetic transition at T c and T 1 and confirmed the first order character of the transition at T 1 and second order character of the transition at T c .