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Fermi-surface and volume-collapse transitions in heavy fermions and pnictide superconductors

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Quantum phase transitions in metals are often accompanied by non-Fermi liquid behavior and the appearence of novel phases in the vicinity of the quantum critical point. Among the interesting theoretical concepts is that of an orbital-selective Mott transition, equivalently a breakdown of the Kondo effect, in two-band systems – such a transition is accompanied by a critical Fermi surface. I will briefly review experimental indications for the existence of such a transition in heavy-fermion metals, and discuss available theories and global phase diagrams. Additionally, I will consider the influence of electron-lattice coupling, which can induce a quantum version of the Kondo volume collapse. Such a transition may be present in the iron pnictide CaFe2As2.

This talk is part of the Theory of Condensed Matter series.

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