Title :
Similarities in the superconducting magnetic transitions of Nb powders and YBa/sub 2/Cu/sub 3/O/sub 7-y/
Author :
Andrade, R., Jr. ; Avila, M.A. ; de Campos, S.P. ; de Lima, O.F.
Author_Institution :
Inst. de Fisica, Univ. Estadual de Campinas, Brazil
fDate :
3/1/1993 12:00:00 AM
Abstract :
Similarities in the AC susceptibility curves and critical fields in the region near the transition onset are examined for Nb powder and YBa/sub 2/Cu/sub 3/O/sub 7-y/ in the low-field region. The results are interpreted as a general behavior of any granular sample, possibly linked with the surface sheath superconductivity.<>
Keywords :
barium compounds; high-temperature superconductors; magnetic susceptibility; niobium; superconducting critical field; superconducting transition temperature; type II superconductors; yttrium compounds; AC susceptibility curves; Nb powder; YBa/sub 2/Cu/sub 3/O/sub 7-y/; critical fields; granular sample; high temperature superconductors; magnetic transitions; surface sheath superconductivity; Conductivity; Fluctuations; Granular superconductors; Magnetization; Niobium; Powders; Solids; Superconducting magnets; Superconducting materials; Temperature sensors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
