Probing the Superconducting State of FeTe_0.55Se_0.55 with Point-Contact Spectroscopy

The material FeTe_1-xSe_x provides an easy platform to study the Iron-based superconductors due to its simple crystal structure and relatively high superconducting transition temperature. In addition, some recent ARPES and STM studies suggest that FeTe0.55Se0.45 may be topologically non-trivial. With this in mind, we use Point-Contact Differential Conductance studies to further investigate this material. We find a “Cusp-like” Zero Bias Conductance Peak (ZBCP) emerges below T_c. The magnetic field dependence of this ZBCP is investigated as a function of field angle and temperature in order to determine its physical origin.