Breakdown of the Fermi liquid theory in heavy fermion compounds

Details Breakdown of the Fermi liquid theory in heavy fermion compounds Breakdown of the Fermi liquid theory in heavy fermion compounds

2002-11-14

arxiv.org/abs/cond-mat/0211284v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures; proceedings to the LT23 conference, Hiroshima (02)

Scientific paper

We review the anomalous properties of heavy fermion compounds like CeCu$_{6-x}$Au$_x$ or CeMIn$_5$ 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 YbRh$_2$Si$_2$, 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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