Title :
Zero resistance above 100 K in Bi-based superconductors
Author :
Green, S.M. ; Jiang, C. ; Mei, Yu ; Luo, H.L. ; Politis, C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Califronia Univ., San Diego, La Jolla, CA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors have concentrated on the effect of Pb on the superconducting properties of the Bi-Sr-Ca-Cu-O system. Preliminary results are also presented on the effect of varying the Sr:Ca and Bi:Ca ratios in Pb-substituted samples. It is shown that the addition of Pb does not guarantee a step-free resistive transition. The steps in the resistivity become more pronounced as the Bi:Ca ratio is increased. This gradual, systematic change suggests that the reduced continuity is not the result of an abrupt reduction in the c-spacing near grain boundaries as observed in Pb-free samples
Keywords :
bismuth compounds; calcium compounds; high-temperature superconductors; lead compounds; strontium compounds; superconducting transition temperature; 100 K; Bi:Ca ratio; BiSrPbCaCuO; Pb-substituted samples; Sr:Ca ratio; high temperature superconductivity; reduced continuity; step-free resistive transition; superconducting properties; zero resistance; Bismuth; Composite materials; Conductivity; Electric resistance; Knee; Solids; Superconducting magnets; Superconducting materials; Superconducting transition temperature; Superconductivity;
Journal_Title :
Magnetics, IEEE Transactions on
