TOPICAL REVIEW: How do Fermi liquids get heavy and die?

  title={TOPICAL REVIEW: How do Fermi liquids get heavy and die?},
  author={Piers Coleman and Catherine P{\'e}pin and Qimiao Si and Revaz Ramazashvili},
  journal={Journal of Physics: Condensed Matter},
We discuss non-Fermi liquid and quantum critical behaviour in heavy-fermion materials, focusing on the mechanism by which the electron mass appears to diverge at the quantum critical point. We ask whether the basic mechanism for the transformation involves electron diffraction off a quantum critical spin-density wave, or whether a breakdown in the composite nature of the heavy electron takes place at the quantum critical point. We show that the Hall constant changes continuously in the first… 

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