Breakdown of the Fermi liquid theory in heavy fermion compounds

2002/11/14 by Pepin, C., Coleman, P.
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.cond-mat/0211284

Abstract

We review the anomalous properties of heavy fermion compounds like CeCu_6-xAu_x or CeMIn₅ close to a zero temperature phase transition called a quantum critical point. Anomalous behavior of the resistivity, specific heat and magnetic properties observed in various compounds suggests a fundamental breakdown of the Fermi liquid theory. Recent measurements on YbRh₂Si₂, field-tuned through the quantum critical point, provide interesting insights on the evolution of the Fermi liquid close to criticality. We discuss the possibility of a kind of spin-charge separation at the quantum critical point and make some remarks about its possible link with the underscreened Kondo model.

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