Title :
Phase locking of HTS Josephson junctions closed into a superconducting loop
Author :
Beuven, S. ; Darula, M. ; Schubert, J. ; Zander, W. ; Siegel, M. ; Seidel, P.
Author_Institution :
Inst. fur Schicht- und Ionentechnik, Forschungszentrum Julich GmbH, Germany
fDate :
6/1/1995 12:00:00 AM
Abstract :
We investigated the mutual interaction of four high-T/sub c/ Josephson junctions which were closed into a superconducting loop. Phase locking of all four junctions was demonstrated in the temperature range from 4.2 K to 48 K. Locking intervals of 18% of the critical current were obtained up to voltages corresponding to a frequency of 180 GHz, according to the second Josephson relation. By comparing our data with numerical simulations, we could show that the junctions were locked in the in-phase state and that the circuit can act as a source of coherent radiation which can deliver power to a load.<>
Keywords :
Josephson effect; high-temperature superconductors; phase locked loops; 180 GHz; 4.2 to 48 K; HTS Josephson junctions; coherent radiation source; critical current; in-phase state; numerical simulation; phase locking; second Josephson relation; superconducting loop; Capacitance; Circuits; Critical current; Feeds; Frequency; Grain boundaries; High temperature superconductors; Inductance; Josephson junctions; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
