Title :
Flux flow of La-Sr-Cu-O single crystals
Author :
Tachiki, T. ; Nakajima, K. ; Yamashita, T. ; Tanaka, I. ; Kojima, H.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
We measured voltages across micro-bridges fabricated along the c-axis of La/sub 2-x/Sr/sub x/CuO/sub 4/ single crystals under an external magnetic field. A sharp voltage peak appears when the magnetic field was aligned to the ab plane within a few degrees. The vortex velocity estimated from the maximum voltage is much lower than the velocity that was measured in Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ single crystals. If many weak point-like pinning centers are assumed to be in the sample, the angular dependence of the voltage is explained by the collective flux creep model.
Keywords :
ceramics; flux creep; flux flow; high-temperature superconductors; lanthanum compounds; magnetic field effects; strontium compounds; vortices; La-Sr-Cu-O; La-Sr-Cu-O single crystals; La/sub 2-x/Sr/sub x/CuO/sub 4/ single crystals; collective flux creep model; external magnetic field; flux flow; micro-bridges fabrication; point-like pinning centers; voltage angular dependence; Bismuth compounds; Crystals; Current measurement; Electrical resistance measurement; Magnetic field measurement; Plasma measurements; Plasma waves; Superconducting coils; Velocity measurement; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
