Signal properties of radio frequency SQUID with a finite amplitude of the second harmonic in the current-phase relationship

Author

Ilichev, E. ; Greenberg, Ya.S. ; Ijsselsteijn, R.P.J. ; Schultze, V. ; Hoenig, H.E. ; Meyer, H.-G.

Author_Institution

Dept. of Cryoelectron., Inst. for Phys High. Technol., Jena, Germany

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1114

Lastpage

1117

Abstract

The signal properties of radio frequency (rf) SQUIDs with a finite amplitude of the second harmonic in the current-phase relationship have been theoretically and experimentally investigated. Both amplitude as well as phase detection has been considered in order to readout the SQUID´s output signal. We observed peculiarities of the rf SQUID response of a SQUID with YBCO 45 degree grain boundary Josephson junction. We found that the current-phase relationship contains a finite amplitude of the second harmonic. Comparison of the theoretical and experimental results is given. It is shown that the sign of the amplitude of the second harmonic can be determined from the shape of experimental curves, and the value of this amplitude is defined by the positions of extrema of these curves

Keywords

Josephson effect; SQUIDs; barium compounds; grain boundaries; high-temperature superconductors; yttrium compounds; RF SQUID; YBCO grain boundary Josephson junction; YBaCuO; amplitude detection; current-phase characteristics; phase detection; second harmonic amplitude; signal properties; Circuits; Grain boundaries; Inductance; Josephson junctions; Phase detection; RF signals; Radio frequency; Resonance; SQUIDs; Shape;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919543

Filename

919543