Title :
Fabrication and properties of YBCO tunnel junctions by ion beam sputtering
Author :
Cai, X.Y. ; Usami, K. ; Kobayashi, T. ; Goto, T.
Author_Institution :
Univ. of Electro-Commun., Tokyo, Japan
fDate :
6/1/1995 12:00:00 AM
Abstract :
Au/SrTiO/sub 3//YBCO tunnel junctions were fabricated by ion beam sputtering. The electrodes of YBCO and SrTiO/sub 3/ barrier layer were deposited on MgO [100] substrate at 700/spl deg/C and 550/spl deg/C respectively. The electrodes of YBCO had a T/sub c/ of 70/spl sim/80 K. SrTiO/sub 3//YBCO bilayers have been examined by X-ray diffraction and the results show that both the YBCO and barrier layer were well oriented. The current-voltage (I-V) and dV/dI-V characteristics of the junctions were measured. In a pin hole free junction, the resistance dip, corresponding to the density of states, was obtained at voltage of 22 mV.<>
Keywords :
Josephson effect; barium compounds; gold; high-temperature superconductors; sputter deposition; strontium compounds; superconducting device testing; superconducting junction devices; yttrium compounds; 22 mV; 550 C; 70 to 80 K; 700 C; Au-SrTiO/sub 3/-YBa/sub 2/Cu/sub 3/O/sub 7/; Au/SrTiO/sub 3//YBCO tunnel junctions; MgO; MgO [100] substrate; SrTiO/sub 3/ barrier layer; SrTiO/sub 3//YBCO bilayers; X-ray diffraction; current-voltage characteristics; density of states; electrodes; ion beam sputtering; pin hole free junction; resistance dip; Current measurement; Electrical resistance measurement; Electrodes; Fabrication; Gold; Ion beams; Sputtering; Voltage; X-ray diffraction; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
