Title :
RF-Current Effects on Intrinsic Josephson Junctions
Author :
Saleem, Sajid ; Fenton, Jon C. ; Korsah, Michael ; Speller, Susannah ; Grovenor, Chris R M ; Warburton, Paul A.
Author_Institution :
London Centre for Nanotechnol., Univ. Coll. London, London, UK
fDate :
6/1/2009 12:00:00 AM
Abstract :
We have fabricated intrinsic Josephson junction arrays using Tl2Ba2CaCu2O8 thin films. The junctions have dimensions of order 1 mum2 and therefore high slope resistance in the range 1 kOmega to 10 kOmega per junction on the quasiparticle branches. We have irradiated the junctions with microwaves at a frequency of 6.37 GHz. We observe both microwave-induced vortex-flow branches and strong suppression of the switching current but only when no junctions are in the voltage state. We attribute this observation to the shunting of the high-resistance junctions by the environmental impedance, and discuss the significance of this result for the application of intrinsic junctions as THz sources and qubits.
Keywords :
barium compounds; calcium compounds; microwave oscillators; superconducting arrays; superconducting junction devices; superconducting thin films; thallium compounds; RF-current effects; Tl2Ba2CaCu2O8; environmental impedance; frequency 6.37 GHz; high-resistance junctions; intrinsic Josephson junctions; microwave-induced vortex-flow branches; resistance 1 kohm to 10 kohm; slope resistance; switching current suppression; thin films; Josephson arrays; Josephson oscillators; Josephson vortex flow;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2019226
