Quasi-Particle Tunneling of D-Wave Superconductors

Hong-Wen Cheng；Li-Fu Chang；C. C. Chi；M. K. Wu

Chinese Journal of Physics

36卷2S期（1998 / 04 / 01）

232 - 237

英文

There are apparently contradicting evidence about the high-Tc superconducting order parameter symmetry from the experimental studies of Josephson currents. Although there are far more experimental studies about the quasi-particle tunneling of high-Tc superconductors in various geometries, it is difficult to extract the nature of the order parameter because of lacking theoretical comparison. We calculate I-V curves and dI/dV-V curves of quasi-particle tunneling from high-Tc superconductor to normal metal. The normal state of the high-Tc superconductor is assumed to be that of a 2-D tight-binding model. Numerical results along different crystalline directions for the d-wave symmetry are carried out. The differences in the conductance spectra are emphasized and compared with available experimental data.