NMR study of the Mott transitions to superconductivity in the two Cs_3C_60 phases

Details NMR study of the Mott transitions to superconductivity in the two Cs_3C_60 phases NMR study of the Mott transitions to superconductivity in the two Cs_3C_60 phases

2010-03-15

arxiv.org/abs/1003.2937v1

Phys. Rev. Lett. 104 256402 (2010)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures.

Scientific paper

10.1103/PhysRevLett.104.256402

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.

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