Random field effects in field-driven quantum critical points
被引:0
|
作者:
F. Anfuso
论文数: 0引用数: 0
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机构:University of Cologne,Institute for Theoretical Physics
F. Anfuso
A. Rosch
论文数: 0引用数: 0
h-index: 0
机构:University of Cologne,Institute for Theoretical Physics
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;
D O I:
暂无
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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.