Random field effects in field-driven quantum critical points

被引:0
|
作者
F. Anfuso
A. Rosch
机构
[1] University of Cologne,Institute for Theoretical Physics
来源
The European Physical Journal B | 2009年 / 69卷
关键词
71.10.-w Theories and models of many-electron systems; 71.27.+a Strongly correlated electron systems; heavy fermions; 75.10.-b General theory and models of magnetic ordering;
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学科分类号
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.
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页码:465 / 471
页数:6
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