Magnetic-field dependence of the zero-bias conductance peak observed in Pb/BSCCO junctions

Recently, a lot of interest has been generated on the behavior of the zero- bias conductance peak (ZBCP) observed in high-T-c superconductor tunnel jun ctions. It is believed that the properties of the ZBCP suggest the pairing symmetry of the superconductor. The ZBCP shows interesting responses with t emperature and applied fields. In this paper we report results of measureme nts of the ZBCP up to a magnetic field of 5 tesla. Many of our junctions us e a Pb film as the counter electrode, which is superconducting when T less than or equal to 7.2 K and H less than or equal to 0.08 T. This provides us with a unique opportunity for studying the interaction between superconduc tors with different pairing symmetry.