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Superconducting Properties of NbN-SiO_2 Sol-Gel Derived Thin Films

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Kościelska B., Yuzephovich O., Bengus S., Witkowska A.
Acta Physica Polonica A
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2010
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vol. 118
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issue 2
383-385
EN
This work presents results of superconducting properties studies of xNbN-(100-x)SiO_2 (where x = 80 mol%) films of the thickness from 450 to 1950 nm. The films were prepared by thermal nitridation of sol-gel derived xNb_2O_5-(100-x)SiO_2 coatings. The nitridation process of Nb_2O_5-SiO_2 coatings leads to the formation of weakly disordered structures, with NbN metallic grains dispersed in the matrix of insulating SiO_2. All the samples in the normal state exhibit negative temperature coefficient of resistivity. Superconducting transition was not observed for the sample 450 nm thick. To examine the influence of magnetic field on superconducting properties of the films, the resistance versus temperature of 1350 and 1650 nm thick samples was measured in high magnetic fields. Resistive superconducting transitions are broadened due to the magnetic flux creep. The perpendicular upper critical magnetic fields for 1350 and 1650 thick samples are about 4.4 T. The critical temperatures of the superconducting transitions are about 4.5 K. Specific features of the magnetic field induced superconductor-insulator transition are found.
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Superconducting Properties of VN-SiO_{2} Sol-Gel Derived Thin Films

76%
Kościelska B., Yuzephovich O., Bengus S., Winiarski A., Sadowski W., Łapiński M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 4
832-835
EN
In this work studies of structure and superconducting properties of VN-SiO_{2} films are reported. The films were obtained through thermal nitridation (ammonolysis) of sol-gel derived V_{2}O_{3}-SiO_{2} coatings (in a proper V_{2}O_{3}/SiO_{2} ratio) at 1200°C. This process leads to the formation of disordered structure with VN metallic grains dispersed in the insulating SiO_{2} matrix. The structural transformations occurring in the films as a result of ammonolysis were studied using X-ray photoelectron spectroscopy (XPS). The critical superconducting parameters are obtained. The magnetoresistance at high magnetic fields has been investigated.
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