No abstract available

No abstract available

No abstract available

[en] The experimental investigation of the energy gap in the excitation spectrum of ZrN superconducting film in ZrN-I-Pb tunnel junctions is performed. For 1.9 K temperature the energy gap value equal to 0.97 Mev is obtained. It is shown that the critical temperature dependence of superconducting transition for investigated films can be described in the framework of the microscopic theory of proximity effect with parameter γm 0.23

[en] Superconducting properties, pinning and electric resistance of zirconium nitride films with the thickness d=23-240 nm, which are produced on different substrates at T_s=450-1000 deg C, are investigated. Evaluation of λ_d, ξ_d, electron effective mass and Fermi rate parameters is made for the studied films

[en] A study of tunneling contacts made from films of niobium nitride with upper electrodes consisting of lead and niobium films, in which tunneling barriers were produced by thermal oxidation of the base electrodes is reported

[en] Full text: Perspective [1] Josephson Mo-Re alloy-oxide-Pb, Mo-Re alloy-normal metal-oxide-Pb and Mo-Re alloy-normal metal-oxide- normal metal-Mo-Re alloy junctions have been fabricated and investigated. Thin (∼50-100 nm) MoRe superconducting films are deposited on Al₂O₃ substrates by using a dc magnetron sputtering of MoRe target. Normal metal (Sn, Al) thin films are deposited on the MoRe films surfaces by thermal evaporation of metals in vacuum and oxidized to fabricate junctions oxide barriers. Quasiparticle I-V curves of the fabricated junctions were measured in wide range of voltages. To investigate a transparency spread for the fabricated junctions barriers the computer simulation of the measured quasiparticle I-V curves have been done in framework of the model of multiple Andreev reflections in double-barrier junction interfaces. It's demonstrated the investigated junctions can be described as highly asymmetric double-barrier Josephson junctions with great difference between the two barrier transparencies [2,3]. The result of the comparison of experimental quasiparticle I-V curves and calculated ones is proposed and discussed. Results of computer simulation of quasiparticles I-V curves of NbN-based junctions are presented and discussed. Also I-V curves of the fabricated junctions have been measured under microwave irradiation with 60 GHz frequency , clear Shapiro steps in the measured I-V curves were observed and discussed. (authors)

[en] Squids are the principal unit of superconducting (SC) measuring devices which determines the metrological characteristics of these devices. Among various types of squids, Nb-Al_xO_y-Nb tunnel junction dc squids have a very low level of intrinsic noise (below 10^-6 Φ₀/√(Hz)) However, NbN dc squids are also interest. This fact is stipulated by the wish to have dc squids which are stable to thermal cycling, humidity and electrostatic charges. The intrinsic noise of NbN dc squids is appreciably higher than that of Nb dc squids. For example, white noise of NbN-MgO-NbN dc squids studied in detail in was about 10^-6 Φ/√(Hz) with the beginning 1/f noise near 100 Hz. The present report is about the creation and study of noise of one more variant of NbN dc squids, those with NbN-Nb₂O₅-Nb tunnel junctions. (orig.)