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

Abstract

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.

5 pages, 5 figures.

References in corpus (1)

• Influence of local fullerene orientation on the electronic properties of A3C60 compounds

Cited by in corpus (7)

• Dynamical Jahn--Teller effect and antiferromagnetism in Cs${}_3$C${}_{60}$
• NMR in strongly correlated materials
• Electronic correlations stabilize the antiferromagnetic Mott state in Cs${}_3$C${}_{60}$
• The Mott State and Superconductivity in Face-Centred Cubic Structured Cs3C60: A 133Cs-Nuclear Magnetic Resonance Study under Pressure
• Unconventional orbital ordering and emergent dimensional reduction in fulleride superconductors
• From Friedel oscillations and Kondo effect to the pseudogap in cuprates
• Nanoscale orbital excitations and the infrared spectrum of a molecular Mott insulator: A15-Cs${}_3$C${}_{60}$