Relative cooling power of La(FexSi1-x)13 after controlling the Curie temperature by hydrogenation and partial substitution of Ce

A. Fujita; S. Fujieda; K. Fukamichi

doi:10.1016/j.jmmm.2006.10.962

Relative cooling power of La(Fe_xSi_1-x)₁₃ after controlling the Curie temperature by hydrogenation and partial substitution of Ce

A. Fujita, S. Fujieda, K. Fukamichi

Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

The relative cooling power (RCP) was evaluated in the itinerant-electron metamagnetic (IEM) La(Fe_xSi_1-x)₁₃ after controlling T_C 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 B_C and the change in the magnetization ΔM at the first-order Curie temperature T_C. Since dB_C/dT is irrelevant to T_C, ΔM dominates the magnitude of RCP. The change of ΔM after controlling T_C 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.

Original language	English
Pages (from-to)	e1006-e1007
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.962
Publication status	Published - 2007 Mar 1

Keywords

Itinerant electron metamagnetic transition
Magnetocaloric effect
Relative cooling power

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "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.",

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AU - Fukamichi, K.

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N2 - 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.

AB - 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.

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KW - Magnetocaloric effect

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