Title :
Superconducting Coulomb-Blockade electrometers with tunable Josephson coupling
Author :
Amar, A. ; Song, D. ; Lobb, C.J. ; Wellstood, F.C.
Author_Institution :
Center for Supercond. Res., Maryland Univ., College Park, MD, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We report measurements made on superconducting Al-AlO/sub x/-Al Coulomb-blockade electrometers with fixed gap /spl Delta/ and charging energy E/sub c/, but tunable Josephson coupling E/sub j/ via application of a magnetic field. This allows us to investigate the effects of changing the E/sub j//E/sub c/ ratio on the device characteristics. We compare the observed modulation with respect to magnetic field and gate voltage with the theoretical predictions in the supercurrent region.
Keywords :
charge measurement; electrometers; superconducting junction devices; Al-AlO-Al; charging energy; gap; magnetic field; superconducting Coulomb-blockade electrometer; tunable Josephson coupling; Couplings; Current measurement; Educational institutions; Josephson effect; Josephson junctions; Magnetic field measurement; Stationary state; Superconductivity; Temperature; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
