RESONANT-TUNNELING IN HIGH-T-C SUPERCONDUCTORS

A review is presented of the author's work on resonance tunneling as a n electron transport mechanism along the c-axis in high-temperature la yered cuprates. Problem formulation is given, qualitative aspects of t he mechanism are described, and physical properties calculated. Compar isons are made with experimental data for the temperature dependence o f normal conductivity, the frequency dependence of optical conductivit y, and stationary supercurrent along the c-axis. For the latter proper ty, resonance tunneling coherence of different centres is shown to be of crucial importance. Weakened interplane coupling and vortex fluctua tions are invoked to explain the sharp drop in T-c and the rise in the 2 Delta(0)/T-c ratio with decreasing oxygen content. Simple example m odels are given to demonstrate major aspects of resonance tunneling.