Title :
Observation of supercurrent distribution in YBCO thin film devices by photoexcited THz radiation
Author :
Hangyo, M. ; Shikii, S. ; Yamashita, M. ; Kondo, T. ; Tonouchi, M. ; Tani, M. ; Sakai, K.
Author_Institution :
Res. Center for Supercond. Mater. & Electron., Osaka Univ., Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
A new method of imaging supercurrent distribution in high-T/sub c/ superconducting film devices using the photoexcited THz radiation is proposed and demonstrated. The images are obtained by scanning focused femtosecond Laser pulses on superconducting film devices with detecting the THz radiation. The characteristic distribution of the transport and persisting currents is obtained and interpreted in terms of the Bean critical state model.
Keywords :
barium compounds; current distribution; high-temperature superconductors; photoexcitation; submillimetre wave imaging; superconducting thin films; yttrium compounds; Bean critical state model; THz radiation imaging; YBCO thin film device; YBaCuO; high-T/sub c/ superconductor; persisting current; scanning focused femtosecond laser pulse photoexcitation; supercurrent distribution; transport current; Focusing; Laser modes; Laser theory; Optical films; Optical pulses; Space vector pulse width modulation; Superconducting films; Switches; Thin film devices; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
