LOW-TEMPERATURE MAGNETIC-PROPERTIES OF UAL2 - THE KONDO EFFECT

被引：1

作者：

KUWAI, T ^{[1
]}

MIYAKO, Y ^{[1
]}

机构：

[1] OSAKA UNIV, FAC SCI, DEPT EARTH & SPACE SCI, TOYONAKA, OSAKA 560, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1994年 / 63卷 / 10期

关键词：

UAL2; SPECIFIC HEAT; SCHOTTKY ANOMALY; KONDO EFFECT; SPIN FLUCTUATIONS; HEAVY FERMION;

D O I：

10.1143/JPSJ.63.3808

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the specific heat in the temperature range between 1.5 and 50 K on UAl2, classified as a paramagnetic 5f heavy fermion compound. A pronounced Schottky-like peak is observed at about 40 K with the peak height of 6 J/K mol in the electronic specific heat. Moreover, T3 ln T temperature dependence in the specific heat is strongly suppressed below about 9 K in the case of U(Al1-ySiy)2 (0<yless-than-or-equal-to0.10), whereas no apparent change is observed for (U1-xPrx)Al2 (0<xless-than-or-equal-to0.15). The electronic specific heat coefficient, gamma, is considerably enhanced with increasing Pr concentration. The gamma-value and the inverse of the absolute value of the paramagnetic Curie temperature both for (U1-xPrx)Al2 and U(Al1-ySiy)2 are varied with the lattice parameter. These behaviors are understood within the framework of the Kondo effect.

引用

页码：3808 / 3814

页数：7

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