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. © 2023 by the authors.Ministry of Education and Science of the Russian Federation, Minobrnauka: 122021000034-9, 122021000039-4; Russian Science Foundation, RSF: 18-72-10098The results of Section 1, Section 2, Section 3.1 and Section 3.2 (magnetic properties and electronic structure calculations) were obtained within the grant of the Russian Science Foundation No. 18-72-10098, https://rscf.ru/en/project/18-72-10098/ (accessed on 29 December 2022). The results of Section 3.3 were obtained within the state assignment of Ministry of Science and Higher Education of the Russian Federation (themes “Magnet” No. 122021000034-9 and “Electron” No. 122021000039-4)