Title :
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
fDate :
6/1/1999 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
