Hoshino, Shintaro Werner, Philipp 2017-04-28 The alkali-doped fullerides A3C60 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 RbxCs3−xC60 is an experimental realization of this novel state of matter. application/pdf https://folia.unifr.ch/global/documents/305584 https://folia.unifr.ch/documents/305584/files/wer_sos.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.118.177002 info:eu-repo/semantics/openAccess License undefined Physical Review Letters. - 2017, vol. 118, no. 17, p. 177002 info:eu-repo/classification/udc/53 Spontaneous orbital-selective mott transitions and the Jahn-Teller metal of ${a}_{3}{\mathrm{c}}_{60}$ http://purl.org/coar/resource_type/c_6501