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(a) Temperature dependences of ZFC and FC magnetizations for ErFeSi compound under a magnetic field of 0.05 T. The inset shows the temperature variation of inverse dc susceptibility (χ −1) fitted to the Curie-Weiss law in the field of 1 T. (b) The ac susceptibilities of ErFeSi collected at various frequencies under a zero dc field. The inset shows the magnetic hysteresis loop of ErFeSi compound at 5 K in low magnetic fields.
Temperature dependences of the ZFC and FC magnetizations for ErFeSi under various magnetic fields.
(a) Magnetization isotherms and (b) Arrott plots of ErFeSi around the ordering temperature in different temperature steps.
Temperature dependence of heat capacity (CP ) for ErFeSi measured in the fields of 0, 2, and 5 T, respectively.
(a) Magnetic entropy changes of ErFeSi calculated from magnetizations (open symbols) and heat capacity measurements (full symbols) as a function of temperature for different magnetic field changes up to 5 T. (b) Adiabatic temperature changes of ErFeSi as a function of temperature for the field changes of 2 and 5 T, respectively.
The ordering temperature (Tord ), the magnetic entropy change ΔSM , adiabatic temperature change ΔTad , and the refrigerant capacity RC for ErFeSi and some other refrigerant materials with a magnetic ordering temperature around liquid hydrogen temperature (20.3 K).
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