## 抄録

The behavior of the metamagnetic transition and the magnetic susceptibility maximum in the Lu(Co_{1-x}Sn_{x})_{2}, Lu(Co _{1-x}Ge_{x})_{2}, Lu(Co_{1-x}Si _{x})_{2}, Y(Co_{1-x}Al_{x})_{2}, Y(Co_{1-x}Ga_{x})_{2} and Y(Co_{1-x}Si _{x})_{2} compounds has been investigated. The critical magnetic field μ_{0}H_{c} for the metamagnetic transition decreases with the increase of x in Lu(Co_{1-x}Sn_{x})_{2}, Lu(Co_{1-x}Ge_{x})_{2}, Lu(Co_{1-x}Si _{x})_{2}, Y(Co_{1-x}Al_{x})_{2} and Y(Co_{1-x}Ga_{x})_{2}, accompanied by a decrease of the magnetic susceptibility maximum temperature T_{max}. The larger the lattice expansion, the stronger the concentration dependences of μ_{0}H_{c} and T_{max} in the Lu(Co _{1-x}Sn_{x})_{2}, Lu(Co_{1-x}Ge _{x})_{2} and Lu(Co_{1-x}Si_{x})_{2} systems. The exchange-enhanced Pauli paramagnetic properties are affected by the lattice expansion. The relation between the critical field of the metamagnetic transition μ_{0}H_{c} and the inverse magnetic susceptibility at T_{max}, χ(T_{max})^{-1}, is fitted to a universal straight line. The onset of ferromagnetism in Y(Co _{1-x}Ga_{x})_{2} has been verified for the first time. The values of the magnetic moment M_{s} and the Curie temperature T _{C} of Y(Co_{1-x}Ga_{x})_{2} are smaller than those of Y(Co_{1-x}Al_{x})_{2}. On the other hand, no evidence of the onset of a ferromagnetic state is obtained in the Y(Co _{1-x}Si_{x})_{2} compounds with 0.00 ≤ x ≤ 0.15. The ferromagnetism appears in both Lu(Co_{1-x}M_{x})_{2} and Y(Co_{1-x}M_{x})_{2} only when M is one of the group IIIA elements Al or Ga, implying that the p-d hybridization has a more significant effect on the onset of ferromagnetism than the lattice expansion.

本文言語 | English |
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ページ（範囲） | 43-50 |

ページ数 | 8 |

ジャーナル | Journal of Alloys and Compounds |

巻 | 394 |

号 | 1-2 |

DOI | |

出版ステータス | Published - 2005 5月 17 |

## ASJC Scopus subject areas

- 材料力学
- 機械工学
- 金属および合金
- 材料化学