## 抄録

Effects of pressure P on the magnetic moment M and the Curie temperature T _{C} have been investigated for La(Fe _{x}Si _{1-x})] _{13} above and below the magnetic phase boundary concentration x = 0.86. where the ferromagnetic-paramagnetic transition at T _{C} 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. T _{C} for the second-order transition has a large negative pressure coefficient dT _{C}/dP and its magnitude increases with increasing x. Above x = 0.86, the magnitude of dT _{C}/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 dT _{C}/dP above x = 0.86 is enhanced by the increase of instability of the ferromagnetic state.

本文言語 | English |
---|---|

ページ（範囲） | 478-481 |

ページ数 | 4 |

ジャーナル | Materials Transactions |

巻 | 47 |

号 | 3 |

DOI | |

出版ステータス | Published - 2006 3月 |

## ASJC Scopus subject areas

- 材料科学（全般）
- 凝縮系物理学
- 材料力学
- 機械工学

## フィンガープリント

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