Ia. Chaban, MAGNETIC-PROPERTIES OF HIGH-TEMPERATURE SUPERCONDUCTORS - ANALYSIS WITHIN THE FRAMEWORK OF THE IMPURITY MECHANISM, Journal of superconductivity, 9(1), 1996, pp. 33-42
The impurity mechanism proposed earlier is used to interpret the magne
tic properties of high-temperature superconductors. The appearance of
superconductive granules and the existence of weak bonds in grains of
ceramics and in single crystals is explained. The irreversibility line
is obtained and its new interpretation as the line of thresholds of a
ppearance of infinite nonsuperconductive cluster is given. The relaxat
ion time of the magnetic susceptibility in alternating magnetic fields
is calculated. The decrease of the Meissner fraction with increase in
magnetic field and decrease in doping, and other magnetic properties
are explained.