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We present a detailed NMR study of the insulator to metal transition inducedby an applied pressure $p$ in the A15 phase of Cs$_{3}$C$_{60}$. We evidencethat the insulating antiferromagnetic (AF) and superconducting (SC) phases onlycoexist in a narrow $p$ range. At fixed $p$, in the metallic state above the SCtransition $T_c$, the $^{133}$Cs and $^{13}$C NMR spin lattice relaxation dataare seemingly governed by a pseudogap like feature. We prove that this feature,also seen in the $^{133}$Cs NMR shift data is rather a signature of the Motttransition, which broadens and smears out progressively for increasing $(p,T)$.The analysis of the variation of the quadrupole splitting $\nu _{Q}$ of the$^{133}$Cs NMR spectrum precludes any cell symmetry change at the Motttransition and only monitors a weak variation of lattice parameter. Theseresults open an opportunity to consider theoretically the Mott transition in amultiorbital three dimensional system well beyond its critical point.

Mott transition in the A15 phase of Cs$_{3} $C$_{60}$: absence of pseudogap and charge order