The relative cooling power (RCP) was evaluated in the itinerant-electron metamagnetic (IEM) La(FexSi1-x)13 after controlling TC by hydrogenation and partial substitution of Ce for La. It is found that RCP is related to the temperature dependence of the IEM transition field BC and the change in the magnetization ΔM at the first-order Curie temperature TC. Since dBC/dT is irrelevant to TC, ΔM dominates the magnitude of RCP. The change of ΔM after controlling TC is caused by stability of the ferromagnetic state because of the increase of the Fe-Fe distance due to hydrogenation and by the hybridization of electron bands between Ce and Fe in the partially substituted system.
- Itinerant electron metamagnetic transition
- Magnetocaloric effect
- Relative cooling power
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics