Oscillations of Josephson-vortex flow resistance in narrow intrinsic Josephson junctions

Oscillations of Josephson vortex-flow resistance have been studied in narrow (L/spl sim/2-4/spl lambda//sub J/) Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+/spl delta// intrinsic Josephson junctions as a function of magnetic field applied parallel to junction edges. Lengths of junctions fabricated are /spl...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.912-915
Main Authors: Hatano, T., Huabing Wang, Sunmi Kim, Urayama, S., Kawakami, S., Sang-Jae Kim, Nagao, M., Inomata, K., Takano, Y., Yamashita, T., Tachiki, M.
Format: Article
Language:English
Subjects:
Applied sciences
Bi-2212
Electronics
Exact sciences and technology
Flow resistance
Fluid dynamics
FLUID FLOW
FLUIDITY
flux-flow
Frequency
Immune system
Insulation
intrinsic Josephson junctions
Josephson junctions
Lattices
LATTICES (CRYSTAL)
MAGNETIC FIELD
Magnetic field measurement
Magnetic fields
Materials science and technology
Oscillations
Oscillators
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Superconducting epitaxial layers
superconductor
SUPERCONDUCTORS
vortex lattice
Vortices
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Summary:Oscillations of Josephson vortex-flow resistance have been studied in narrow (L/spl sim/2-4/spl lambda//sub J/) Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+/spl delta// intrinsic Josephson junctions as a function of magnetic field applied parallel to junction edges. Lengths of junctions fabricated are /spl sim/1 /spl mu/m in order to enhance pinning effects of Josephson vortex lattice to the junction edges and thus to enhance formation of rectangular vortex lattice which would lead an in-phase mode of the junctions as a necessary condition for the THz generator application. The observed Josephson vortex flow resistance showed a periodic oscillation with a period (H/sub p/) corresponding to one flux quantum enters per junction, namely, corresponding to the rectangular vortex lattice. Observed strong oscillation was a result of collective behavior of the entry and escape of vortices in a form of rectangular vortex lattice. Peaks in the oscillations were found at the fields H=nH/sub p/, here n shows an integer number. Here, Josephson vortex lattice flow speed shows a local maximum. With this magnetic field, outermost vortex rows geometrically match to the edges of junctions. Contrary to this, a minimum of flow speed, namely pinned state of the vortex lattice, was observed at H=(n+1/2)H/sub p/.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.850115