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Point-contact (PC) investigations on the title compound in the normal andsuperconducting (SC) state (Tc=10,6 K) are presented. The temperaturedependence of the SC gap of TmNi2B2C determined from Andreev-reflection (AR)spectra using the standard single-gap approximation (SGA) deviates from the BCSbehavior in displaying a maximum at about Tc/2. A refined analysis within thetwo-gap approximation provides evidence for the presence of a second gap twiceas large as the main gap (the first one), while the latter is close to thatwithin the SGA. This way, TmNi2B2C expands the number of nickel borocarbidesuperconductors which exhibit a clear multiband character. Additionally, forthe first time "reentrant" features were found in the AR spectra for some PCsmeasured in a magnetic field. The PC spectroscopy of the electron-bosoninteraction in TmNi2B2C in the normal state reveals a pronounced phonon maximumat 9.5meV and a more smeared one around 15 meV, while at higher energies the PCspectra are almost featureless. Additionally, the most intense peak slightlyabove 3meV observed in the PC spectra of TmNi2B2C is presumably caused bycrystalline-electric-field (CEF) excitations. The peak near 1meV detected forsome PC spectra is connected with a modification of the CEF probably due toboron or carbon vacancies, allowing to probe the local stoichiometry by PCspectroscopy.

Peculiarities of the superconducting gaps and the electron-boson interaction in TmNi2B2C as seen by point-contact spectroscopy