Title :
Fabrication of YBa/sub 2/Cu/sub 3/O/sub 7//AlO/sub x//Nb quasiparticle tunnel junctions
Author :
Lee, S.G. ; Lee, Y.H. ; Kwon, H.C. ; Park, K. ; Park, Y.K. ; Park, J.C.
Author_Institution :
Korea Res. Inst. of Stand. & Sci., Taejon, South Korea
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors have fabricated superconductor-insulator-normal metal (SIN) tunnel junctions with c-axis-oriented YBCO thin films as the superconducting electrodes and studied the tunneling characteristics of the junctions by measuring the zero-bias junction resistance as a function of temperature and dI/dV as a function of the bias voltage. Measured junction resistance showed characteristic tunneling properties with a strong semiconducting background, which is ascribed to the imperfect tunnel barrier. dI/dV curves indicated gap structures at 27 mV and 4.5 mV, respectively, with a parabolic background.<>
Keywords :
aluminium compounds; barium compounds; high-temperature superconductors; niobium; superconductive tunnelling; yttrium compounds; YBa/sub 2/Cu/sub 3/O/sub 7/-AlO/sub x/-Nb; high temperature superconductor; quasiparticle tunnel junctions; superconductor-insulator-normal metal; tunneling characteristics; zero-bias junction resistance; Electrical resistance measurement; Electrodes; Fabrication; Josephson junctions; Silicon compounds; Superconducting thin films; Temperature; Tunneling; Voltage; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
