Title :
Quasiparticle mixing in Ba-K-Bi-O grain boundary junctions
Author :
Takami, T. ; Wada, Y. ; Kuroda, K. ; Ozeki, T. ; Hamanaka, K.
Author_Institution :
Adv. Technol. R&D Center, Mitsubishi Electr. Corp., Hyogo, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
A Ba/sub 1-x/K/sub x/BiO/sub 3/ (BKBO) grain boundary junction formed on a MgO bicrystal substrate showed a superconductor-insulator-superconductor (SIS) behavior with a sharp gap structure and a Josephson current. A 270 GHz millimeter wave mixing in a BKBO junction was performed by using the quasi optical technique. A log-periodic antenna, a hyperhemispherical MgO lens and a Teflon lens were used in order to improve coupling for millimeter wave. The IF outputs have some peaks depending on the photon assisted tunneling steps. This is the first time that quasi-particle mixing could be done in an oxide superconductor.
Keywords :
barium compounds; grain boundaries; high-temperature superconductors; millimetre wave mixers; potassium compounds; quasiparticles; superconducting energy gap; superconductive tunnelling; superconductor-insulator-superconductor mixers; 270 GHz; Ba-K-Bi-O grain boundary junction; BaKBiO/sub 3/; Josephson current; MgO bicrystal substrate; Teflon lens; energy gap; hyperhemispherical lens; log-periodic antenna; oxide superconductor; photon assisted tunneling; quasi-optical millimeter wave mixing; quasiparticle mixing; superconductor-insulator-superconductor structure; Biomedical optical imaging; Grain boundaries; Josephson effect; Josephson junctions; Lenses; Log periodic antennas; Millimeter wave technology; Optical mixing; Superconducting devices; Tunneling;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
