New Universality Class of Quantum Criticality in Ce- and Yb-based Heavy Fermions

Abstract

A new universality class of quantum criticality emerging in itinerant electron systems with strong local electron correlations is discussed. The quantum criticality of a Ce- or Yb-valence transition gives us a unified explanation for unconventional criticality commonly observed in heavy fermion metals such as YbRh2Si2 and β-YbAlB4, YbCu5-xAlx, and CeIrIn5. The key origin is due to the locality of the critical valence fluctuation mode emerging near the quantum critical end point of the first-order valence transition, which is caused by strong electron correlations for f electrons. Wider relevance of this new criticality and important future measurements to uncover its origin are also discussed.

arXiv comment20 pages, 4 figures

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• Intact Quasiparticles at an Unconventional Quantum Critical Point
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• New Quantum Criticality Revealed under Pressure
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• Critical Behavior and Duality in Dimensionally Reduced Planar Chern-Simons Superconductors
• Magnetic structure and crystal field states of antiferromagnetic CeNiGe${}_3$: Neutron scattering and $\mu$SR investigations