Flux motion in YBCO biepitaxial Josephson junctions

Author

Sung, H.H. ; Yang, S.Y. ; Horng, H.E. ; Yang, H.C.

Author_Institution

Dept. of Electr. Eng., Da-Yeh Univ., ChangHua, Taiwan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

3937

Lastpage

3940

Abstract

We have measured the current-voltage characteristics of overdamped long YBa/sub 2/Cu/sub 3/O/sub 7/ biepitaxial Josephson junctions. The velocity-matching step was observed in the current-voltage characteristics with an applied magnetic field. The presence of velocity-matching steps suggests that the biepitaxial Josephson junction is formed around a dielectric-like barrier between superconducting grains. Anomalous subharmonic voltage steps were found under microwave irradiation. The relations between anomaly steps and fluxon motion are discussed.

Keywords

Josephson effect; barium compounds; flux flow; high-temperature superconductors; superconducting epitaxial layers; superconducting junction devices; superconducting microwave devices; yttrium compounds; YBa/sub 2/Cu/sub 3/O/sub 7/; anomalous subharmonic voltage steps; applied magnetic field; biepitaxial Josephson junctions; current-voltage characteristics; dielectric-like barrier; flux motion; microwave irradiation; overdamped long junctions; superconducting grains; velocity-matching step; velocity-matching steps; Current measurement; Current-voltage characteristics; Electric variables measurement; Josephson junctions; Magnetic field measurement; Physics; Substrates; Superconducting microwave devices; Voltage; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783889

Filename

783889