  Impurity doping like Zn atoms in cuprates were systematically studied to
provide important information on the pseudogap phase because this process
substantially reduces $T_c$ without effect $T^*$. Despite many important
results and advances, the normal phase of these superconductors is still
subject of a great debate. We show that the observed Zn-doped data can be
reproduced by constructing a nanoscale granular superconductor whose
resistivity transition is achieved by Josephson coupling, what provides also a
simple interpretation to the pseudogap phase.
