Microwave response of intrinsic Josephson junctions in BSCCO single crystals

Author

Irie, A. ; Oya, G.

Author_Institution

Dept. of Electr. & Electron. Eng., Utsunomiya Univ., Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

3267

Lastpage

3271

Abstract

We have studied the microwave response of an array of intrinsic Josephson junctions in the c-axis direction in large Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 7/ (BSCCO) single crystals indicating multiple resistive branches on the I-V characteristics. Under the 8-10 GHz microwave irradiation, they showed three types of responses depending on its power P. For relatively low P, the Shapiro steps were observed, whose voltage separations were two order magnitude larger than that calculated from /spl Delta/V=hf/2e, indicating that about one hundred intrinsic junctions in the crystal are phase-locked. For high P, two types of RF-induced steps were observed. In the case of resonance mode, the I-V curve showed the pronounced constant voltage step together with subharmonic ones. On the other hand, for off-resonance mode the broad step was observed. The voltages of these steps increased lineally with p/sup 1/2/. These results suggest that the fluxon motions in intrinsic Josephson junctions interact with external RF field.<>

Keywords

Josephson effect; bismuth compounds; calcium compounds; high-temperature superconductors; microwaves; resonance; strontium compounds; superconducting junction devices; superconducting microwave devices; 8 to 10 GHz; BSCCO single crystals; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 7/; I-V characteristics; I-V curve constant voltage step; Josephson junction array; RF-induced steps; Shapiro steps; broad step; external RF field; fluxon motions; intrinsic Josephson junctions; microwave irradiation; microwave response; multiple resistive branches; offresonance mode; resonance mode; subharmonic steps; Bismuth compounds; Circuits; Crystals; Equations; Josephson junctions; Superconducting devices; Superconducting epitaxial layers; Superconducting microwave devices; Superlattices; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403289

Filename

403289