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The magnetic field effect on the phase diagram of the organic Mott system$\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Br in which the bandwidth was tuned bythe substitution of deuterated molecules was studied by means of theresistivity measurements performed in magnetic fields. The lower critical pointof the first-order Mott transition, which ended on the upper critical field$H_{\rm c2}$-temperature plane of the superconductivity, was determinedexperimentally in addition to the previously observed upper critical end point.The lower critical end point moved to a lower temperature with the suppressionof $T_{\rm c}$ in magnetic fields and the Mott transition recognized so far asthe $S$-shaped curve reached $T =$ 0 when $H > H_{\rm c2}$ in the end.

Mott transition and superconductivity in the strongly correlated organic superconductor $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}]$Br