场驱动量子临界点中的随机场效应
Random Field effects in field-driven quantum critical points
摘要：
研究了无序对金属反铁磁体场驱动量子相变的作用。对于具有足够低对称性的系统，均匀外部场和非磁性杂质的组合有效地导致随机磁场，其强烈地修改接近临界点的行为。利用微扰重整化群，我们研究了在相图的哪个区域无序影响临界性质。在重费米子系统中，即使很弱的无序也会导致局部近藤温度的强烈波动，随机场效应尤其明显。本文研究了随机场效应在实验中的可能表现，并讨论了CeCu_（5.8）Au_（0.2）中子散射场致量子相变的结果。
英文摘要：
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 riven quantum phase transition in CeCu_5.8Au_0.2.
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