Random field effects in field-driven quantum critical points

被引：2

作者：

Anfuso, F. ^{[1
]}

Rosch, A. ^{[1
]}

机构：

[1] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany

来源：

EUROPEAN PHYSICAL JOURNAL B | 2009年 / 69卷 / 04期

关键词：

FERMI-LIQUID BEHAVIOR; ISING-MODEL; PHASE-TRANSITIONS; SYSTEMS; CECU6-XAUX;

D O I：

10.1140/epjb/e2009-00191-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate the role of disorder for field-driven quantum phase transitions of metallic antiferromagnets. For systems with sufficiently low symmetry, the combination of a uniform external field and non-magnetic impurities leads effectively to a random magnetic field which strongly modifies the behavior close to the critical point. Using perturbative renormalization group, we investigate in which regime of the phase diagram the disorder affects critical properties. In heavy fermion systems where even weak disorder can lead to strong fluctuations of the local Kondo temperature, the random field effects are especially pronounced. We study possible manifestation of random field effects in experiments and discuss in this light neutron scattering results for the field driven quantum phase transition in CeCu5.8Au0.2.

引用

页码：465 / 471

页数：7

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