The European Physical Journal B

, Volume 69, Issue 4, pp 465–471 | Cite as

Random field effects in field-driven quantum critical points

Solid State and Materials

Abstract

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.

PACS

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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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Institute for Theoretical PhysicsUniversity of CologneCologneGermany

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