The itinerant-electron metamagnetic (IEM) transition and magnetocaloric effects (MCE's) in the La(FexSi1-x)13 and La(FexSi1-x)13Hy compounds have been investigated. The La(FexSi1-x)13 compounds exhibit large values of both the isothermal entropy change ΔSm and the adiabatic temperature change ΔTad around the Curie temperature TC in relatively low magnetic fields. Such large MCE's are explained by a large magnetization change at TC and a strong temperature dependence of the critical field BC for the IEM transition. By hydrogen absorption into the compounds, TC is increased up to about 330 K, keeping the metamagnetic transition properties. Accordingly, the extension of the working temperature range having the large MCE's in relatively low magnetic fields is demonstrated by controlling y in the La(FexSi1-x)13Hy compounds. The correlation between the increase of TC and the large MCE's in the La(FexSi1-x)13Hy compounds is discussed by taking the magnetovolume effects into consideration.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2003 3 15|
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