Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

We present the effect of substitution-induced pressure on the reversibility of the magnetocaloric effect (MCE) in Ni₂Cr_xMn_1.4−xIn_0.6 (x = 0.1, 0.2, 0.3) alloys, through characterization in pulsed magnetic fields.We measured the adiabatic temperature change ΔT_ad directly during applied magnetic field pulses of 2 and 6 T. We paid special attention to the reversibility of ΔT_ad. The substitution of Mn by Cr in Ni₂Mn_1.4In_0.6 leads to a negative pressure, as evidence by the increase of the lattice parameters, which shifts the martensitic transition towards lower temperatures and enhances the ferromagnetism of the martensite phase.We found a large value of ΔT_ad = −7 K at T = 270 K for the sample with x = 0.1 for a field change of 6 T. We discuss the reversibility of the MCE in these alloys in terms of the Clausius-Clapeyron equation.