POSSIBILITY OF MACROSCOPIC RESONANT-TUNNELING NEAR THE SUPERCONDUCTOR-INSULATOR TRANSITION IN YBA2CU3O7-GAMMA THIN-FILMS

Experimental results of the I-V characteristics near the superconducto r-insulator transition observed for disorder-tuned YBa2Cu3O7-delta thi n films are presented. The I-V characteristics exhibit new quasiperiod ic structures as a function of the current. The current interval, the number of the dI/dV peaks, and the magnetic-field dependence of the pe aks are consistent with the theoretical predictions of the resonant tu nneling of a phase particle in a tilted-cosine potential for a single Josephson junction with small capacitance.