Non magnetic molecular Jahn-Teller Mott insulators

Abstract

Narrow-band conductors may turn insulating and magnetic as a consequence of strong electron-electron correlation. In molecular conductors, the concomitance of a strong Jahn-Teller coupling may give rise to the alternative possibility of a non-magnetic insulator, with or without a static cooperative Jahn-Teller distortion. In the latter case the insulator has Mott-like properties, with an interesting interplay between electron-electron repulsion and the Jahn-Teller effect, which is dynamical. We study this kind of non-magnetic insulator in a very simple $E\otimes e$ Jahn-Teller model and we discuss its general properties in a more general context, also in connection with the insulating state of K_{4}C_{60} and Rb_{4}C_{60}.

21 pages, Revtex, one included figure with epsfig.sty

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• Tuning fulleride electronic structure and molecular ordering via variable layer index
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• Spontaneous orbital-selective Mott transitions and the Jahn-Teller metal of A${}_3$C${}_{60}$
• Theory of the Metal-Paramagnetic Mott-Jahn-Teller Insulator Transition in A_4C_{60}
• Direct Transition Between a Singlet Mott Insulator and a Superconductor
• Role of dynamic Jahn-Teller distortions in Na2C60 and Na2CsC60 studied by NMR
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• Evidence for Insulating Behavior in the Electric Conduction of (NH${}_3$)K${}_3$C${}_{60}$ Systems
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• NMR study of the Superconducting gap variation near the Mott transition in Cs${}_3$C${}_{60}$
• Local Kekulé distortion turns twisted bilayer graphene into topological Mott insulators and superconductors
• Filling dependence of the Mott transition in the degenerate Hubbard model
• Photo-induced nonequilibrium states in Mott insulators
• Ultrafast switching of composite order in A${}_3$C${}_{60}$
• Superconducting Chevrel phase PbMo${}_6$S${}_8$ from first principles
• Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated A${}_3$C${}_{60}$
• Reversible phase transformation and doubly-charged anions at the surface of simple cubic RbC60
• Phase segregation on the nanoscale in Na2C60
• The $E\otimes e$ Jahn-Teller Polaron in Comparison with the Holstein Polaron
• Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
• Visualizing molecular orientational ordering and electronic structure in CsnC60 fulleride films
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• Metal-to-insulator evolution in (NH3)xNaK2C60: an NMR study
• Ordered low-temperature structure in K4C60 detected by infrared spectroscopy
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• Strongly Correlated Superconductivity rising from a Pseudo-gap Metal
• Dynamical Jahn--Teller instability in metallic fullerides
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• The degenerate 3-band Hubbard model with "anti-Hund's rule" interactions; a model for AxC60
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• Electronic correlations stabilize the antiferromagnetic Mott state in Cs${}_3$C${}_{60}$
• Orthorhombic fulleride (CH3NH2)K3C60 close to Mott-Hubbard instability: Ab initio study
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• NMR investigation of the pressure induced Mott transition to superconductivity in Cs3C60 isomeric compounds
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• Properties of the doped spin 3/2 Mott insulator near half filling
• Doping asymmetry and layer-selective metal-insulator transition in trilayer K${}_{3+x}$C${}_{60}$