Abstract
Based on the theory of the itinerant-electron metamagnetism, an isothermal magnetic entropy change is discussed for 3d transition metal compounds. The magnetic entropy change depends not only on the magnetization jump at the Curie temperature, but also on the temperature dependence of the critical field of the metamagnetic transition. The isothermal magnetic entropy changes for Co(S,Se) 2, Lu(Co,Al) 2 and Lu(Co,Ga) 2 are estimated and compared with those observed for MnFe(P,As) and La(Fe,Si) 13.
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