Concentration Dependence of Pressure Effect in La(FexSi1-x)13 Compounds

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  • Fujita Asaya
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Fukamichi Kazuaki
    Institute for Multidisciplinary Research for Advanced Materials, Tohoku University
  • Goto Tsuneaki
    Institute for Solid State Physics, The University of Tokyo

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タイトル別名
  • Concentration Dependence of Pressure Effect in La(Fe<I><SUB>x</SUB></I>Si<SUB>1−<I>x</I></SUB>)<SUB>13</SUB> Compounds
  • Concentration Dependence of Pressure Effect in La(Fe<I><SUB>x</SUB></I>Si<SUB>1&minus;<I>x</I></SUB>)<SUB>13</SUB> Compounds

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Effects of pressure P on the magnetic moment M and the Curie temperature TC have been investigated for La(FexSi1−x)13 above and below the magnetic phase boundary concentration x=0.86, where the ferromagnetic-paramagnetic transition at TC changes from the first-order (x≥0.86) to the second-order (x<0.86). The pressure coefficient of M exhibits a sluggish variation against concentration and no anomaly was observed at x=0.86, being consistent with the Landau expansion model. On the other hand, TC for the second-order transition has a large negative pressure coefficient dTC⁄dP and its magnitude increases with increasing x. Above x=0.86, the magnitude of dTC⁄dP for the first-order transition increases with x, contrary to the theoretical expectation. It has been revealed that the spin-wave dispersion coefficient becomes smaller when the first-order transition becomes clear by changing the concentration and also applying pressure. Consequently, it is plausible that dTC⁄dP above x=0.86 is enhanced by the increase of instability of the ferromagnetic state.

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