TUNNELING AND CRITICAL-MAGNETIC-FIELD STUDY OF SUPERCONDUCTING NBC THIN-FILMS

Electronic characteristics and superconducting-state parameters of NbC thin films prepared by reactive laser beam deposition were studied by tunneling and critical-magnetic-field measurements. For the first tim e these investigations were made for NbC samples of practically perfec t stoichiometric chemical composition and crystal structure. This comp ound with low-temperature normal resistivity of 4.6 mu Omegacm and cr itical temperature of 12 K was found to be a clean superconductor (1 = 36nm, xi(0) = 23 nm) characterized by an intermediate type of electr on-phonon interaction (lambda = 0.91).