Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-06-08
J. Low. Temp. Phys. 161, 203 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
29 pages, 4 figs, mini-review prepared for a special issue of JLTP
Scientific paper
10.1007/s10909-010-0206-3
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.
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