Title :
Josephson junctions with bulk YBa2Cu3O7-x, Bi2Sr2 CaCu2Ox and Tl2Ca2Ba 2Cu3O10+x
Author :
Eidelloth, W. ; Barnes, F.S. ; Geller, S. ; Wu, K.Y. ; Sheng, Z.Z. ; Hermann, A.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
The characteristics of point contacts with combinations of Pb, YBa 2Cu3O7-x, Bi2Sr2CaCu2Ox, (YBCO), (BSCCO), and Tl2Ca2Ba2Cu3O 10+x (TCBCO) have been measured in a shielded liquid helium dewar. Zero-voltage currents were found in all arrangements; diffraction patterns in the voltage-flux curves were observed with all materials. Electron pairs were confirmed as carriers in all investigated high-T c materials. All junctions resembled weak-link bridge structures rather than tunnel junctions. Despite strong shunting, hysteresis was found in the I-V curves of some point contacts. A structure of unknown origin was found in the I-V curves of YBCO-BSCCO junctions. Both YBCO-YBCO and BSCCO-BSCCO junctions had much lower normal resistances and considerably higher critical currents than YBCO-BSCCO point contacts. The reason for this phenomenon is not yet understood
Keywords :
Josephson effect; barium compounds; bismuth compounds; calcium compounds; critical currents; high-temperature superconductors; point contacts; strontium compounds; thallium compounds; yttrium compounds; Bi2Sr2CaCu2Ox; I-V curves; Josephson junctions; Tl2Ca2Ba2Cu3O 10+x; YBa2Cu3O7-x; critical currents; diffraction patterns; electron pairs; high temperature superconductor; hysteresis; normal resistances; point contacts; strong shunting; voltage-flux curves; weak-link bridge structures; zero voltage currents; Bismuth compounds; Bridge circuits; Diffraction; Electrons; Helium; Hysteresis; Josephson junctions; Strontium; Voltage; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
