title: NMR study of the Mott transitions to superconductivity in the two Cs3C60 phases.
abstract: We report a NMR and magnetometry study on the expanded intercalated fulleride Cs3C60 in both its A15 and face centered cubic structures. NMR allowed us to evidence that both exhibit a first-order Mott transition to a superconducting state, occurring at distinct critical pressures p{c} and temperatures T{c}. Though the ground state magnetism of the Mott phases differs, their high T paramagnetic and superconducting properties are found similar, and the phase diagrams versus unit volume per C60 are superimposed. Thus, as expected for a strongly correlated system, the interball distance is the relevant parameter driving the electronic behavior and quantum transitions of these systems.
authors.affiliation: Laboratoire de Physique des Solides, Universite Paris-Sud 11, CNRS UMR 8502, 91405 Orsay, France. ihara@lps.u-psud.fr
authors.forename: Y
authors.initials: Y
authors.lastname: Ihara
authors.forename: H
authors.initials: H
authors.lastname: Alloul
authors.forename: P
authors.initials: P
authors.lastname: Wzietek
authors.forename: D
authors.initials: D
authors.lastname: Pontiroli
authors.forename: M
authors.initials: M
authors.lastname: Mazzani
authors.forename: M
authors.initials: M
authors.lastname: Riccò