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

Metals - Tập 13 Số 2 - Trang 290
А. Г. Кучин1, S.P. Platonov1, Р. Д. Мухачев1, A. V. Lukoyanov2,1, А. С. Волегов3,1, Vasilii Gaviko3,1, M.Yu. Yakovleva1
1M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108, Ekaterinburg, Russia
2Institute of Physics and Technology, Ural Federal University Named after the First President of Russia B.N. Yeltsin, 620002 Ekaterinburg, Russia
3Institute of Natural Sciences and Mathematics, Ural Federal University Named after the First President of Russia B.N. Yeltsin, 620026 Ekaterinburg, Russia

Tóm tắt

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.

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Metals

Tập 13 Số 2

290

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