Quantum Criticality in Heavy Fermion Metals

Details Quantum Criticality in Heavy Fermion Metals Quantum Criticality in Heavy Fermion Metals

2007-12-13

arxiv.org/abs/0712.2045v2

Nature Physics 4, 186 - 197 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

(v2) 39 pages, 8 figures; shortened per the editorial mandate; to appear in Nature Physics. (v1) 43 pages, 8 figures; Non-tech

Scientific paper

10.1038/nphys892

Quantum criticality describes the collective fluctuations of matter undergoing a second-order phase transition at zero temperature. Heavy fermion metals have in recent years emerged as prototypical systems to study quantum critical points. There have been considerable efforts, both experimental and theoretical, which use these magnetic systems to address problems that are central to the broad understanding of strongly correlated quantum matter. Here, we summarize some of the basic issues, including i) the extent to which the quantum criticality in heavy fermion metals goes beyond the standard theory of order-parameter fluctuations, ii) the nature of the Kondo effect in the quantum critical regime, iii) the non-Fermi liquid phenomena that accompany quantum criticality, and iv) the interplay between quantum criticality and unconventional superconductivity.

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