RF coupling to single crystal BSCCO under c-axis bias

Author

Hohenwarter, G.K.G. ; Laundrie, A.W. ; Lee, J.U. ; Beyer, J.B. ; Nordman, J.E.

Author_Institution

Parkview R&D Inc., Madison, WI, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

3195

Lastpage

3198

Abstract

We have explored rf coupling to BSCCO single crystals with c-axis bias currents over a wide range of frequencies. A structure was developed that afforded the necessary impedance transformations at several frequencies from dc to 35 GHz. At low frequencies, connections were made to a coaxial cable. At X-band, the sample was placed in front of a short section of waveguide, forming a resonator. Above 12 GHz, the sample mount formed a coplanar resonator. At 35 GHz it was used as the end plate of a cylindrical cavity with degenerate mode spoilers and a loaded Q-factor of 3800 at 38.3 GHz. Fabricated BSCCO samples showed evidence of hysteretic Josephson junction stack behavior at 77 K. Application of low frequency rf signals caused steps to appear in the sample I-V. At frequencies above 6.4 GHz only a reduction of critical current was observed.<>

Keywords

Josephson effect; bismuth compounds; calcium compounds; high-temperature superconductors; strontium compounds; superconducting microwave devices; superconducting resonators; 0 to 35 GHz; 77 K; BiSrCaCuO; RF coupling; X-band; c-axis bias currents; coaxial cable; coplanar resonator; critical current; cylindrical cavity; degenerate mode spoilers; hysteretic Josephson junction stack; impedance transformations; loaded Q-factor; resonator; sample mount; single crystal BSCCO; waveguide; Bismuth compounds; Bonding; Coaxial cables; Crystals; Feeds; High temperature superconductors; Impedance; Radio frequency; Research and development; Resonance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403271

Filename

403271