Strong Pressure Effect on the Curie Temperature of Itinerant-Electron Metamagnetic La(Fe0.88Si0.12)13Hy and La0.7Ce0.3(Fe0.88Si0.12)13Hy

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  • Fujieda Shun
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Fujita Asaya
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Fukamichi Kazuaki
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

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  • Strong Pressure Effect on the Curie Temperature of Itinerant-Electron Metamagnetic La(Fe<SUB>0.88</SUB>Si<SUB>0.12</SUB>)<SUB>13</SUB>H<I><SUB>y</SUB></I> and La<SUB>0.7</SUB>Ce<SUB>0.3</SUB>(Fe<SUB>0.88</SUB>Si<SUB>0.12</SUB>)<SUB>13</SUB>H<I><SUB>y</SUB></I>

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The initial pressure shift of the Curie temperature Tc for the first-order transition, dTc⁄dP, for La(Fe0.88Si0.12)13 becomes small after hydrogen absorption. In addition, the hydrogen absorption reduces the ratio of the volume change at Tc to the magnetization squared at Tc, Δω(Tc)⁄M(Tc)F2, suggesting the decrease of the magnetoelastic coupling constant κCmv. On the other hand, dTc⁄dP is enhanced by the partial substitution of Ce for La in connection with the change of the band structure. Consequently, dTc⁄dP of La0.7Ce0.3(Fe0.88Si0.12)13Hy is larger than that of La(Fe0.88Si0.12)13Hy in a wide change of Tc.

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