Non-logarithmic magnetic relaxation in PbMo₆S₈

The time dependence of the zero-field-cooled magnetization of the extreme type-II superconductor PbMo6S8 has been measured at temperatures 0.7≤T/Tc≤0.95 and for fields 1G≤H≤300G. The results show that the decay changes from a logarithmic to a non-logarithmic form as the field is increased, indicating that the conventional flux creep model is not sufficient to describe the phenomena. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.