Spontaneous orbital-selective Mott transitions and the Jahn-Teller metal of A${}_3$C${}_{60}$

Abstract

The alkali-doped fullerides A${}_3$C${}_{60}$ are half-filled three-orbital Hubbard systems which exhibit an unconventional superconducting phase next to a Mott insulator. While the pairing is understood to arise from an effectively negative Hund coupling, the highly unusual Jahn-Teller metal near the Mott transition, featuring both localized and itinerant electrons, has not been understood. This property is consistently explained by a previously unrecognized phenomenon: the spontaneous transition of multiorbital systems with negative Hund coupling into an orbital-selective Mott state. This symmetry-broken state, which has no ordinary orbital moment, is characterized by an orbital-dependent two-body operator (the double occupancy) or an orbital-dependent kinetic energy, and may be regarded as a diagonal-order version of odd-frequency superconductivity. We propose that the recently discovered Jahn-Teller metal phase of Rb${}_x$Cs${}_{3-x}$C${}_{60}$ is an experimental realization of this novel state of matter.

8 pages, 6 figures

References in corpus (9)

• Hybridization expansion impurity solver: General formulation and application to Kondo lattice and two-orbital models
• Orbital-Selective Mott transition out of band degeneracy lifting
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• Modeling the Unconventional Superconducting Properties of Expanded A${}_3$C${}_{60}$ Fullerides
• Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy
• Enhancing superconductivity in A3C60 fullerides
• Superconductivity in the two-band Hubbard model
• Long-range orders, spin- and orbital-freezing in the two-band Hubbard model
• Superfluid state of repulsively interacting three-component fermionic atoms in optical lattices

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