Possibility of Macroscopic resonant Tunneling near the Superconductor- Insulator Transition in YBaCuO Thin Films

TL;DR

This paper reports experimental observations of quasiperiodic structures in I-V characteristics of YBaCuO thin films near the superconductor-insulator transition, consistent with resonant tunneling phenomena in Josephson junctions.

Contribution

It provides experimental evidence of macroscopic resonant tunneling effects in disordered YBaCuO films near the transition, aligning with theoretical models of phase particle tunneling.

Findings

Observation of quasiperiodic I-V structures

Magnetic field dependence of peaks matches theory

Consistent with resonant tunneling in Josephson junctions

Abstract

Experimental results of I-V characteristics near the superconductor-insulator transition observed for disorder-tuned YBaCuO thinfilms are presented. The I-V characteristics exibit new quasiperiodic structures as a function of the current. The current interval, the number of the dI/dV peaks, and the magnetic field dependence of the peaks are consistent with the theoretical predictions of the resonant tunneling of a phase particle ina tilted-cosine potential for asingle Josephson junction with small capacitance.