A Study of Ni-Substitution Effects on Heavy-Fermion CeCu2Si2 -Similarities between Ni Substitution and High-Pressure Effects

被引：8

作者：

Ikeda, Yoichi ^{[1
]}

Araki, Shingo ^{[1
]}

Kobayashi, Tatsuo C. ^{[1
]}

Shimizu, Yusei ^{[2
]}

Yanagisawa, Tatsuya ^{[2
]}

Amitsuka, Hiroshi ^{[2
]}

机构：

[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan

[2] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2012年 / 81卷 / 08期

关键词：

CeCu2Si2; Ni substitution; heavy fermion; valence fluctuation; T-linear resistivity; MEDIATED SUPERCONDUCTIVITY; MAGNETIC-SUSCEPTIBILITY; VALENCE TRANSITION; BEHAVIOR; CECU2-XNIXSI2; PHASE; EVOLUTION;

D O I：

10.1143/JPSJ.81.083701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The effects of Ni substitution on Ce(Cu1-xNix)(2)Si-2 have been studied by specific heat and electrical resistivity measurements. The specific heat measurement has revealed that the enhanced quantum fluctuations around an antiferromagnetic quantum critical point are markedly suppressed by Ni substitution, and that the Fermi liquid state recovers in the Ni-rich region (x greater than or similar to 0: 12). The characteristic T-linear dependence of the resistivity has been observed at approximately x similar to 0.10 together with a sign of superconductivity. The variation of n in the form of rho - rho(0) = aT(n) against T-1(max), at which the resistivity peaks, coincides with the case of high-pressure experiments on pure CeCu2Si2. The anomalous T-linear behavior appears to occur in the crossover region from the Kondo regime to the valence fluctuation regime rather than in the conventional antiferromagnetic quantum critical region.

引用

页数：4

共 42 条

[1] SUPERCONDUCTIVITY IN CECU2SI2 [J].