Title :
Temperature and field dependence of the effective matrix resistivity of Bi:2223/Ag composites
Author :
Lee, E. ; Sumption, M.D. ; Collings, E.W.
Author_Institution :
LASM, Ohio State Univ., Columbus, OH, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
The effective matrix resistivities of several Bi:2223/Ag superconducting composites were calculated from measurements made with a vibrating sample magnetometer at temperatures ranging from 4.2 K to 70 K with a ramping magnetic field amplitude up to 1.7 T applied perpendicular to the wide side of the sample. The samples were untwisted 19- and 7-filament tapes with width to thickness ratios of about 6 and lengths of 1.3 - 1.5 cm. The measured resistivity values were compared to those derived using Block-Gruneisen theory. As the temperature and/or the magnetic field increased, the effective resistivity increased more rapidly than predicted by the Block-Gruneisen function. This is attributed to an increase in the effective resistivity of the Bi:2223 superconducting filaments due to flux creep.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); eddy current losses; flux creep; high-temperature superconductors; silver; strontium compounds; superconducting tapes; 1.3 to 1.5 cm; 1.7 T; 4.2 to 70 K; Bi:2223/Ag composites; Bi2Sr2Ca2Cu3O10-Ag; Block-Gruneisen theory; effective matrix resistivities; effective matrix resistivity; field dependence; flux creep; high temperature superconductor; ramping magnetic field amplitude; temperature dependence; Conductivity; Creep; Eddy currents; High temperature superconductors; Magnetic field measurement; Magnetometers; Superconducting films; Temperature dependence; Temperature distribution; Vibration measurement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812411