  Bad-Metal (BM) behavior featuring linear temperature dependence of the
resistivity extending to well above the Mott-Ioffe-Regel (MIR) limit is often
viewed as one of the key unresolved signatures of strong correlation. Here we
associate the BM behavior with the Mott quantum criticality by examining a
fully frustrated Hubbard model where all long-range magnetic orders are
suppressed, and the Mott problem can be rigorously solved through Dynamical
Mean-Field Theory. We show that for the doped Mott insulator regime, the
coexistence dome and the associated first-order Mott metal-insulator transition
are confined to extremely low temperatures, while clear signatures of Mott
quantum criticality emerge across much of the phase diagram. Remarkable scaling
behavior is identified for the entire family of resistivity curves, with a
quantum critical region covering the entire BM regime, providing not only
insight, but also quantitative understanding around the MIR limit, in agreement
with the available experiments.
