Orbital-selective Mott transitions: Heavy fermions and beyond

Abstract

Quantum phase transitions in metals are often accompanied by violations of Fermi liquid behavior in the quantum critical regime. Particularly fascinating are transitions beyond the Landau-Ginzburg-Wilson concept of a local order parameter. The breakdown of the Kondo effect in heavy-fermion metals constitutes a prime example of such a transition. Here, the strongly correlated f electrons become localized and disappear from the Fermi surface, implying that the transition is equivalent to an orbital-selective Mott transition, as has been discussed for multi-band transition-metal oxides. In this article, available theoretical descriptions for orbital-selective Mott transitions will be reviewed, with an emphasis on conceptual aspects like the distinction between different low-temperature phases and the structure of the global phase diagram. Selected results for quantum critical properties will be listed as well. Finally, a brief overview is given on experiments which have been interpreted in terms of orbital-selective Mott physics.

29 pages, 4 figs, mini-review prepared for a special issue of JLTP

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Cited by in corpus (5)

• Hund's coupling key role in multi-orbital correlations
• Strange metals and the AdS/CFT correspondence
• Fermi surface topology of the two-dimensional Kondo lattice model: a dynamical cluster approximation approach
• The underdoped cuprates as fractionalized Fermi liquids: transition to superconductivity
• Orbital-selective Mott transition and heavy fermion behavior in a bilayer Hubbard model for 3He