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Point-contact (PC) spectroscopy measurements of YNi2B2C single crystals inthe normal and superconducting (SC) state (T_c=15.4K) for the maincrystallographic directions are reported. The PC study reveals theelectron-phonon interaction (EPI) spectral function with dominant phononmaximum around 12 meV and further weak structures (hump or kink) at higherenergy at about 50 meV. No "soft" modes below 12 meV are resolved in the normalstate. The PC EPI spectra are qualitatively similar for the differentdirections. Contrary, directional study of the SC gap results in\Delta_[100]=1.5 meV for the a direction and \Delta_[001]=2.3 meV along the caxis; however the critical temperature T_c in PC in all cases is near to thatin the bulk sample. The value 2\Delta_[001]/kT_c=3.6 is close to the BCS valueof 3.52, and the temperature dependence \Delta_[001](T) is BCS-like, while thefor small gap \Delta_[100](T) is below BCS behavior at T>T_c/2 similarly as inthe two-gap superconductor MgB2. It is supposed that the directional variation\Delta can be attributed to a multiband nature of the SC state in YNi2B2C.Comment: 9 pages, 10 figures, to be published in a special issue of J. Low  Temp. Phys. in honour of Prof. H. von Loehneyse

Point-Contact Spectroscopy of the Borocarbide Superconductor YNi2B2C in the Normal and Superconducting State