Theory of the Metal-Paramagnetic Mott-Jahn-Teller Insulator Transition in A_4C_{60}

dc.creator	Capone, M.
dc.creator	Fabrizio, M.
dc.creator	Giannozzi, P.
dc.creator	Tosatti, E.
dc.date	1999-05-12
dc.date.accessioned	2026-07-07T08:22:27Z
dc.date.available	2026-07-07T08:22:27Z
dc.description	We study the unconventional insulating state in A_4C_{60} with a variety of approaches, including density functional calculations and dynamical mean-field theory. While the former predicts a metallic state, in disagreement with experiment, the latter yields a (paramagnetic) Mott-Jahn-Teller insulator. In that state, conduction between molecules is blocked by on-site Coulomb repulsion, magnetism is suppressed by intra-molecular Jahn-Teller effect, and important excitations (such as optical and spin gap) should be essentially intra-molecular. Experimental gaps of 0.5 eV and 0.1 eV respectively compare well with molecular ion values, in agreement with this picture.
dc.description	4 pages, 2 postscript figures
dc.identifier	https://arxiv.org/abs/cond-mat/9905156
dc.identifier	http://arxiv.org/abs/cond-mat/9905156
dc.identifier	Phys. Rev. B 62, 7619 (2000)
dc.identifier	doi:10.1103/PhysRevB.62.7619
dc.identifier.uri	http://salesiana.dossiersoluciones.com/handle/123456789/135659
dc.subject	Strongly Correlated Electrons
dc.title	Theory of the Metal-Paramagnetic Mott-Jahn-Teller Insulator Transition in A_4C_{60}
dc.type	text

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