Av. Lukashenko et al., SPATIAL-DISTRIBUTION OF SUPERCONDUCTING P ARAMETERS AND PECULIARITIESOF BEHAVIOR OF ARRAYS OF HTS JOSEPHSON-JUNCTIONS, Fizika nizkih temperatur, 22(10), 1996, pp. 1113-1121
The arrays of ramp-type HTS Josephson junctions connected in series ar
e studied. The local values of critical temperature and current of bot
h electrodes and Josephson junctions in arrays are measured using low-
temperature scanning laser microscope. The top and bottom electrodes a
re found to differ in quality, featuring a gradient of the critical te
mperature that causes the gradient of critical temperature and current
of Josephson junctions along the array. The current-voltage character
istics, also under the microwave irradiation, as well as the temperatu
re dependences of resistance, critical and excess currents are studied
. The existence of a non-equilibrium region in the vicinity of the ram
p junctions associated with phase slip processes is proved.