## 抄録

Single-crystalline samples of YbInCu_{4} and its partially substituted compounds by Y and Lu were synthesized by the flux method. The temperature dependence of the magnetic susceptibility from 2 to 320 K in the magnetic field of 0.5 T and the high-field magnetization up to 41 T under various fixed pressures were measured in order to investigate the effect of substitution, inherent chemical pressure, and external pressure on the first-order valence transition of YbInCu_{4}. Substitution of Yb by Y or Lu results in a small increase or decrease of the lattice parameter, while both systems show a steep decrease of transition temperature (T_{v}) and transition magnetic field (H_{v}) with substitution, resulting in suppression of the valence transition around x=0.30 for Yb_{1-x} Y_{x}InCu_{4} (0≤x≤0.3) and x=0.15 for Yb_{1-x}Lu_{x}InCu_{4} (0≤x≤0.15). The effect of pressure on H_{v} of the pure and Y-substituted YbInCu_{4} is reported by dH_{v}/dP≈-1 T/kbar, with a suppression of the valence transition of Yb_{0.8}Y_{0.2}InCu_{4} at the pressure of 8 kbar. The effect of inherent chemical pressure is very small compared with the intrinsic effect of substitution. The decreasing of Kondo temperature T_{K} (∞1/X_{0}) below T_{v} resulting from the substitution for the Yb lattice is discussed as an important factor affecting the valence transition of YbInCu_{4}.

本文言語 | 英語 |
---|---|

論文番号 | 024112 |

ページ（範囲） | 241121-241128 |

ページ数 | 8 |

ジャーナル | Physical Review B - Condensed Matter and Materials Physics |

巻 | 66 |

号 | 2 |

DOI | |

出版ステータス | 出版済み - 7月 1 2002 |

外部発表 | はい |

## !!!All Science Journal Classification (ASJC) codes

- 電子材料、光学材料、および磁性材料
- 凝縮系物理学

## フィンガープリント

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