Fabrication of Josephson junctions on La-Sr-Cu-O single crystals

Author

Uematsu, Y. ; Myoren, H. ; Nakajima, K. ; Yamashita, T. ; Tanaka, I. ; Kojima, H.

Author_Institution

Res. Inst. of Electr. Commun., Tohoku Gakuin Univ., Sendai, Japan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

4296

Lastpage

4299

Abstract

We have successfully fabricated Josephson junctions on single crystals of La/sub 2-x/Sr/sub x/CuO/sub 4/ (LSCO) high-T/sub c/ superconductor using niobium (Nb) as counter electrodes. A reproducible fabrication process has been established taking into account the surface state of LSCO is dominantly affecting junction properties. The surface state of LSCO has been characterized using XPS. The current voltage curves (IVCs) of Nb/LSCO junctions exhibit RSJ like Josephson junction properties. Due to intrinsic Josephson effect of LSCO, the IVCs branches are first observed for the Nb/LSCO junctions on LSCO mesa whose interfaces are parallel to the ab-plane of LSCO.

Keywords

Josephson effect; X-ray photoelectron spectra; high-temperature superconductors; lanthanum compounds; niobium; strontium compounds; surface treatment; (LaSr)/sub 2/CuO/sub 4/-Nb; Josephson junction; La/sub 2-x/Sr/sub x/CuO/sub 4/ single crystal; Nb/LSCO junction; XPS; current voltage characteristics; fabrication; high-T/sub c/ superconductor; resistively shunted junction; surface treatment; Crystals; Etching; Fabrication; Josephson junctions; Niobium; Plasma applications; Plasma materials processing; Plasma waves; Surface cleaning; Surface treatment;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783975

Filename

783975