POINT-CONTACT SPECTROSCOPY OF TWO-BAND SUPERCONDUCTOR MgB_2

摘要

The progress in the investigation of the two-band superconductor MgB_2 by point-contact spectroscopy (PCS) is reported. Results of the study of superconducting gap temperature and magnetic field dependence for two-dimensional σ and three-dimensional π band and electron-phonon-interaction spectral function are presented. The correlation between the gap value and the intensity of the high T_c driving force - E_(2g) boron vibration mode is provided. PCS data on some nonsuperconducting transition metal diborides are surveyed for comparison.