In-plane tunneling spectroscopy in Bi2Sr2CaCu2O8+δ-SiO-Ag planar junctions

Abstract We report the experimental results of quasiparticle tunneling using Bi 2 Sr 2 CaCu 2 O 8+ δ –SiO–Ag planar junctions. We have measured the {0 0 1}-, {1 0 0}- and {1 1 0}-oriented junctions. For the in-plane ab oriented junctions, a reproducible zero bias conductance peak has been observed. We have analyzed the data by using the extended Andreev bound states model for d-wave superconductors and have considered the roughness effect by averaging over in-plane directions. The experimental results are consistent with the theoretical calculations.