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Superconductivity and the Anomalous Meissner Effect in La 3 CaBa 3 Cu 7 O 15,5 + x Oxide
Author(s) -
Wang ChiMing,
Yang YuFu,
Kao HueyChucn I.,
Wci WenCheng J.
Publication year - 1992
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199200010
Subject(s) - meissner effect , superconductivity , tetragonal crystal system , diamagnetism , chemistry , electrical resistivity and conductivity , condensed matter physics , magnetic susceptibility , stoichiometry , oxide , analytical chemistry (journal) , magnetic field , crystallography , crystal structure , physics , organic chemistry , chromatography , quantum mechanics
A superconducting oxide with a stoichiometry La 3 CaBa 3 Cu 7 O 15.5+x , in which x = 0.75, was prepared. It had a tetragonal triple‐perovskite structure with lattice parameters a = 3.879 Å and c = 11.637 Å. According to resistivity measurements, a sharp superconducting transition, ΔT c (10‐90%) = 1.5 K, and T c(zero) = 80 K were observed. When it was measured at a small magnetic field (10‐20 gauss) with field cooling, the sintered pellet showed a positive magnetic susceptibility, but the powdered sample exhibited (he diamagnetism of a typical superconductor. However, no peculiar shielding effect was found in both the sintered and powdered samples.