Title :
Magnetic response of Y/Pb doped single-crystal Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/ superconductors
Author :
Tochihara, S. ; Goto, A. ; Yasuoka, H. ; Mazaki, H. ; Osada, M. ; Kakihana, M.
Author_Institution :
Dept. of Math. & Phys., Nat. Defense Acad., Yokosuka, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
The magnetic properties of Y/Pb doped single-crystal Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+d/ have been investigated in terms of the magnetization curves measured using a SQUID magnetometer. The observed results were analyzed within the construct of the modified Kim-Anderson critical-state model, where lower critical fields H/sub cl/ and surface barriers /spl Delta/H were explicitly taken into consideration. Analyses have revealed that the magnetic response is closely correlated to the carrier concentration, and both the lower critical field and the pinning force increase with the increase of the carrier concentration in the CuO/sub 2/ plane.
Keywords :
bismuth compounds; calcium compounds; carrier density; flux pinning; high-temperature superconductors; lead compounds; magnetisation; strontium compounds; superconducting critical field; yttrium compounds; (BiPb)/sub 2/Sr/sub 2/CaYCu/sub 2/O/sub 8/; SQUID magnetometry; carrier concentration; critical fields; doped single-crystal; magnetic response; magnetization curves; modified Kim-Anderson critical-state model; pinning force; surface barriers; Magnetic analysis; Magnetic field measurement; Magnetic hysteresis; Magnetic materials; Magnetization; SQUID magnetometers; Strontium; Superconducting magnets; Superconductivity; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
