Phenomena in coupled superconducting weak links
Thesis/Dissertation
·
OSTI ID:6570298
Interactions between two independently biasable coupled superconducting microbridges were studied. Some bridges were fabricated within 2 mu m of each other. Quasiparticles from one bridge affect the other. In a second type of sample, the microbridges were separated by 10 mu m and coupled via a resistive shunt. The interaction results from the current flowing through the shunt. Similar effects are seen in both types of samples. In opposed biased bridges, the effective critical current is decreased because of the interaction. For series biased bridges, the effective critical current of one bridge is decreased or increased, depending on the voltage across the other bridge. These interactions lead to voltage steps in the I-V curves where, for opposed biased bridges, both voltages increase; for series bias, one voltage increases, the other decreases. Experimental results are in reasonable agreement with a second-order perturbation calculation and with an analog simulation. Voltage locking is found for both biasing configurations in both types of samples. Locking can occur simultaneously with a voltage step, resulting in nascent voltage locking which can also occur in conjunction with hysteresis. The effect of a voltage in the pad between the two proximity coupled bridges is to vary the voltage at which locking occurs, which in turn alters the shape of the locking curve. Locking range is calculated in two models for comparison with the two types of samples. The first explicitly considers the time delay for propagation of the charge-imbalance wave from one bridge to the other. The second model considers the current flowing in the resistive/inductive coupling shunt.
- Research Organization:
- State Univ. of New York, Stony Brook (USA)
- OSTI ID:
- 6570298
- Country of Publication:
- United States
- Language:
- English
Similar Records
Interactions between coupled thin-film microbridge Josephson junctions
Mutual phase locking in Josephson junction arrays
Voltage locking and other interactions in coupled superconducting weak links. II. Experiment
Thesis/Dissertation
·
Wed Dec 31 23:00:00 EST 1975
·
OSTI ID:7306057
Mutual phase locking in Josephson junction arrays
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1981
·
OSTI ID:6825693
Voltage locking and other interactions in coupled superconducting weak links. II. Experiment
Journal Article
·
Mon Dec 31 23:00:00 EST 1979
· Phys. Rev., B: Condens. Matter; (United States)
·
OSTI ID:5646116