In-plane quasi-particle tunneling into Bi2Sr2CaCu2O8

Abstract Planar tunneling spectroscopy is performed into the a-b plane of the high-temperature superconductor Bi 2 Sr 2 CaCu 2 O 8 . The tunneling spectra exhibit a zero-bias conductance peak (ZBCP). Preliminary studies as a function of temperature, crystallographic orientation, magnetic field magnitude and direction confirm the ZBCP is an Andreev bound state (ABS) at zero energy. Below 5K, a depletion in the density of states at zero energy is observed