On quantum Griffiths effects in metallic systems

Details On quantum Griffiths effects in metallic systems On quantum Griffiths effects in metallic systems

2002-08-21

arxiv.org/abs/cond-mat/0208396v2

Physics

Condensed Matter

Strongly Correlated Electrons

Revised version. Minor errors in section B4 corrected, discussion amplified in several places; discussion of relation of this

Scientific paper

10.1103/PhysRevB.66.174433

Elementary analytical extremal statistics arguments are used to analyse the possibility of quantum Griffiths effects in nearly critical systems with overdamped dynamics, such as arise in conventional theories of metallic quantum criticality. The overdamping is found to strongly suppress quantum tunnelling of rare regions, leading to superparamagnetic rather than quantum griffiths behavior. Implications for theories of non-fermi-liquid behavior in heavy fermion materials are discussed.

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