A heavy-fermion state with singular density of states

被引：21

作者：

Ohara, K ^{[1
]}

Hanzawa, K ^{[1
]}

Yosida, K ^{[1
]}

机构：

[1] Sci Univ Tokyo, Fac Sci & Technol, Dept Phys, Noda, Chiba 2788510, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1999年 / 68卷 / 02期

关键词：

periodic Coqblin-Schrieffer model; heavy fermion; metamagnetism; non Fermi liquid; anisotropic hybridization; CeRu2Si2; CeNi2Ge2;

D O I：

10.1143/JPSJ.68.521

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The metamagnetic behavior of CeRu2Si2 and the non Fermi-liquid behavior of CeNi2Ge2 are described by the periodic Coqblin-Schrieffer model with anisotropic c-f exchange interaction in the mean-field theory. Only the Kramers doublet of M-J = +/-5/2 for the 4f states of Ce ions is considered, for the case of which the density of quasi-particle states has singularity of \omega\(-1/2) around the effective f-level energy. In the asymmetric case applicable to CeRu2Si2, the chemical potential reaches the singularity at a finite magnetic field, at which the magnetization shows a metamagnetic-like increase. On the other hand, in the symmetric case applicable to CeNi2Ge2: the chemical potential is on the singularity at zero magnetic field, and non-Fermi-liquid-like behaviors emerge in the susceptibility and the specific heat.

引用

页码：521 / 530

页数：10

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