TY - JOUR

T1 - Itinerant-electron metamagnetic transition and large magnetocaloric effects inLa(FexSi1-x)13compounds and their hydrides

AU - Fujita, A.

AU - Fujieda, S.

AU - Hasegawa, Y.

AU - Fukamichi, K.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - The itinerant-electron metamagnetic (IEM) transition and magnetocaloric effects (MCE’s) in the (formula presented) and (formula presented) compounds have been investigated. The (formula presented) compounds exhibit large values of both the isothermal entropy change (formula presented) and the adiabatic temperature change (formula presented) around the Curie temperature (formula presented) in relatively low magnetic fields. Such large MCE’s are explained by a large magnetization change at (formula presented) and a strong temperature dependence of the critical field (formula presented) for the IEM transition. By hydrogen absorption into the compounds, (formula presented) 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 (formula presented) compounds. The correlation between the increase of (formula presented) and the large MCE’s in the (formula presented) compounds is discussed by taking the magnetovolume effects into consideration.

AB - The itinerant-electron metamagnetic (IEM) transition and magnetocaloric effects (MCE’s) in the (formula presented) and (formula presented) compounds have been investigated. The (formula presented) compounds exhibit large values of both the isothermal entropy change (formula presented) and the adiabatic temperature change (formula presented) around the Curie temperature (formula presented) in relatively low magnetic fields. Such large MCE’s are explained by a large magnetization change at (formula presented) and a strong temperature dependence of the critical field (formula presented) for the IEM transition. By hydrogen absorption into the compounds, (formula presented) 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 (formula presented) compounds. The correlation between the increase of (formula presented) and the large MCE’s in the (formula presented) compounds is discussed by taking the magnetovolume effects into consideration.

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U2 - 10.1103/PhysRevB.67.104416

DO - 10.1103/PhysRevB.67.104416

M3 - Article

VL - 67

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 0163-1829

IS - 10

ER -