Large Magnetic Entropy Change in GdRuSi Optimal for Magnetocaloric Liquefaction of Nitrogen

The search for new magnetocaloric materials for application in magnetic refrigerants is highly motivated by high efficiency, reliability, and environmental safety. The values of the magnetocaloric effect MCE and the refrigerant capacity RC for the equiatomic GdRuSi compound were determined to be MCE = 10.7 and 4.94 J/kgK and RC = 336 and 92 J/kg with a change in the field of 0-50 and 0-17 kOe, respectively. These high values of MCE and RC for GdRuSi appear in the region of nitrogen liquefaction temperature of 77.4 K, due to which the compound can be useful in practice. The densities of states and magnetic moments of GdRuSi were calculated theoretically, taking into account strong electron correlations in the 4f Gd shell. The total magnetic moment of GdRuSi was found to be composed of the Gd moment only with the value calculated in very good agreement with the experimental one.

Automated summary

The search for new magnetocaloric materials for magnetic refrigerants is driven by the desire for high efficiency, reliability, and environmental safety. The equiatomic GdRuSi compound was found to have high values of magnetocaloric effect (MCE) and refrigerant capacity (RC), at 10.7 and 4.94 J/kgK for MCE, and 336 and 92 J/kg for RC, with magnetic field changes of 0-50 and 0-17 kOe, respectively. These high values occur around the nitrogen liquefaction temperature of 77.4 K, indicating potential practical use. Theoretical calculations of densities of states and magnetic moments show that the total magnetic moment of GdRuSi is contributed solely by the Gd moment, in good agreement with experimental findings.