  An overview on recent efforts in point-contact (PC) spectroscopy of title
superconductors is given. Distinct phonon features and
crystalline-electric-field effects are observed in PC spectra of HoNi2B2C.
Results of study of superconducting (SC) gap and excess current versus
temperature and magnetic field reflecting specific multi-band electronic
structure in MgB2 are presented. The nature of the extremely nonlinear I(V)
curves in the antiferromagnetic (AF) and SC state are elucidated for UPd2Al3
break-junctions and MgCNi3 point contacts.

Superconductivity;Strongly Correlated Electrons