Antiferromagnetic quantum criticality in CeCoGe2.1Si0.9 under pressure

被引：7

作者：

Alzamora, M.

Fontes, M. B.

Larrea, J.

Borges, H. A.

Baggio-Saitovitch, E. M.

Medeiros, S. N.

机构：

[1] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453900 Rio De Janeiro, Brazil

[2] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil

[3] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.76.125106

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the disappearance of antiferromagnetic order in CeCoGe2.1Si0.9 as seen by electrical resistance measurements. The Neel temperature decreases monotonically with pressure, following Doniach's phase diagram for Kondo lattice systems, and vanishes at the critical pressure P-C approximate to 6.2 kbar. The electrical resistivity in the vicinity of P-C shows clearly a non-Fermi-liquid behavior. Beyond that, the system recovers its truly Fermi-liquid state. The nature of this canonical phase diagram is given in a semiquantitative discussion based on two-dimensional spin fluctuations coexisting with a moderate disorder.

引用

页数：7

共 43 条

[1] How generic scale invariance influences quantum and classical phase transitions [J].