Magnetocaloric properties of Ni49.9Mn19.6Cu5.7Ga24.8 single crystal processed by Bridgman method with stationary crucible

Bridgman method with stationary crucible was used to grow NiMnCuGa single crystal. Microstructure observations, as well as XRD pattern, revealed a presence of martensitic structure at room temperature. Crystal structure was determined as a non-modulated tetragonal martensite. The phase transition occurred at 296 K and 290 K on heating and cooling, respectively. Magnetic entropy change (ΔSM) reached a peak value of −9.86 J/kgK at the field of 1520 kA/m. Refrigerant capacity (RC), calculated at FWHM of the ΔSM peak, reached a value of 28.5 J/kg. Directly measured adiabatic temperature change (ΔTad) spread over 51 K range and its maximum value reached 0.23 K at 1520 kA/m field.