The Superconducting Order Parameter in High-Tc Superconductors – A Point-Contact Spectroscopy Viewpoint

Properties of percolation channels in planar memristive structures based on epitaxial films of a YBa2Cu3O7−δ high temperature superconductor

“…Studies of the dynamic resistance R d =dV/dI(V, T) of the structures; the normal metal-superconductor is an efficient tool for tracking the order parameter (superconductive energy gap) in the Andreev reflection effect [22]. Many attempts were made in previous work to find the order parameter in the HTSC-normal metal structures using a microcontact and tunneling spectroscopy [23]. Figures 3, 4 show examples of the dynamic resistance of the metastable states of the structure, R d =(dV/dI(V )), on the temperature with zero anomalies of the Andreev reflection type.…”