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Distribution of activation energies in high Tc superconductors

The distribution of activation energies determined from the measurements of the time dependence of the magnetization is compared for ceramic samples of the different classes of superconductors (YBCO, BSCCO, LSCO, NCCO). A decrease of the relaxation rate is observed for YBCO and BSCCO if the measuring field is changed from Bmin (defined by dM/dB=0) to 1T. Whereas the distributions for YBCO and BSCCO are centred at higher energies, the high energy part of the distribution is more pronounced for LSCO and NCCO.