Title :
Josephson junctions with hysteretic current voltage characteristics at high temperatures
Author :
McBrien, P.F. ; Hadfield, R.H. ; Booij, W.E. ; Moya, A. ; Blamire, M.G. ; Tarte, E.J. ; Clark, J. ; Pegrum, C.M.
Author_Institution :
Interdisciplinary Res. Centre in Supercond., Cambridge Univ., UK
fDate :
6/1/1999 12:00:00 AM
Abstract :
The properties of bicrystal Josephson junctions with external capacitors are reported. It was found that the hysteresis in the current voltage (IV) characteristic was very sensitive to the wavelength of the Josephson oscillation in the dielectric and thermal noise suppression of the critical current. A McCumber parameter /spl beta//sub c/ of 1.2 at 65 K has been achieved. In addition intrinsic grain boundary capacitance has been found to give a large /spl beta//sub c/ value of 9.6 at 4.2 K.
Keywords :
Josephson effect; bicrystals; capacitance; McCumber parameter; bicrystal Josephson junction; capacitor; critical current; current-voltage characteristics; grain boundary capacitance; high temperature; hysteresis; thermal noise; Capacitance; Capacitors; Critical current; Current-voltage characteristics; Hysteresis; Josephson junctions; Superconducting device noise; Superconductivity; Temperature; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
