We report an NMR and magnetometry study on the expanded intercalated fulleride Cs_3C_60 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 (SC) state, occuring 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 SC properties are found similar, and the phase diagrams versus unit volume per C_60 are superimposed. Thus, as expected for a strongly correlated system, the inter-ball distance is the relvevant parameter driving the electronic behavior and quantum transitions of these systems.
@article{arxiv.1003.2937,
title = {NMR study of the Mott transitions to superconductivity in the two Cs_3C_60 phases},
author = {Yoshihiko Ihara and Henri Alloul and Pawel Wzietek and Daniel Pointiroli and Marcello Mazzani and Mauro Riccó},
journal= {arXiv preprint arXiv:1003.2937},
year = {2010}
}