Specific heat study of non-Fermi liquid behavior in CeNi2Ge2: Anomalous peak in quasi-particle density-of-states

被引：36

作者：

Aoki, Y ^{[1
]}

Urakawa, J ^{[1
]}

Sugawara, H ^{[1
]}

Sato, H ^{[1
]}

Fukuhara, T ^{[1
]}

Maezawa, K ^{[1
]}

机构：

[1] TOYAMA PREFECTURAL UNIV, FAC ENGN, TOYAMA 93903, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1997年 / 66卷 / 10期

关键词：

CeNi2Ge2; non-Fermi liquid; heavy fermion; spin fluctuation; specific heat; magnetocaloric effect;

D O I：

10.1143/JPSJ.66.2993

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

To investigate the non-Fermi liquid (NFL) behavior in a nonalloyed system CeNi2Ge2, we have measured the temperature and field dependences of the specific heat C on a CeNi2Ge2 single crystal. The distinctive temperature dependence of C/T (similar to alpha - beta root T) is destroyed in almost the same manner for both field directions of B//c-axis and B//a-axis. The overall behavior of C(T,B) and the low-temperature upturn in chi(T) can be reproduced, assuming an anomalous peak of the quasi-particle-band density-of-states (DOS) at the Fermi energy possessing root epsilon energy dependence. Absence of residual entropy around T = 0 K in B similar to 0 T has been confirmed by the magnetocaloric effect measurements, which are consistent with the present model. The present model can also be applied to the NFL behavior in CeCu5.9Au0.1 using a In(epsilon)-dependent peak in the DOS. Possible origins of the peak in the DOS are discussed.

引用

页码：2993 / 2996

页数：4

共 19 条

[1]

Aoki Y., UNPUB

[2] LOW-TEMPERATURE HEAT-CAPACITY, MAGNETIZATION, RESISTIVITY OF CERU2SI2, WITH Y OR LA SUBSTITUTION [J].