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    Electrical Properites of Superconducting Cross - (nano) Whiskers Junction
    (Tubitak Scientific & Technological Research Council Turkey, 2005) Altin, Serdar; Yakinci, Eyuphan; Balci, Yakup; Aksan, M. Ali
    Bi-2212 superconducting single crystal (nano) whiskers have been fabricated by annealing a melt-quenched (glass) Bi3Sr2Ca2Cu3Ox precursor. A couple of (nano) Whiskers obtained were placed crosswise on a YSZ single crystal substrate and then heat treated at 830 C for 25 minute to form nano-scale junction. The T-c of each nano-whisker was found to be 85 K and the critical current density, J(c), of the whiskers was calculated to be 1177 Acm(-2) at zero field. The I - V characteristics of the nano-junction at 30 K were found to show a multiple-branch structure, which is the main behavior of the Josephson junction.
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    Improved superconducting properties of MgB2 thin films fabricated by ultrasonic spray pyrolysis method at high temperature
    (Elsevier Sci Ltd, 2012) Yakinci, M. Eyyuphan; Yakinci, Z. Deniz; Aksan, M. Ali; Balci, Yakup
    High quality MgB2 superconducting thin films have been successfully prepared by 2.4 MHz ultrasonic spray pyrolysis (USP) system on single crystal Al2O3 (001) substrates. The microstructure, electrical and magnetic properties of approximately 500-600 nm thick films were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) in conjunction with the energy dispersive X-ray analysis (EDX), resistance versus temperature (R-T) and magnetization measurements (M-H) under different magnetic fields and transport critical current density (J(c)). Films were first heat treated in situ in the spraying chamber with an extra Mg powder during deposition to compensate excess evaporation of Mg from the films and then additionally heat treated in Ar atmosphere at 700 degrees C for a short time. According to the results obtained, orientation on any particular direction for the crystal growth was not seen. Homogeneous, highly dense and highly smooth surface morphology and low resistance have been achieved under optimum conditions. Optimally treated films exhibited relatively high transport critical current density of 2.37 x 10(5) A cm(-2). These results have been also compared with the J(c)(mag) results calculated from the M-H curves. The electrical resistance property of the best samples was obtained to be 39.5 and 37.4 K for T-c and T-zero, respectively. (C) 2012 Elsevier Ltd. All rights reserved.