Gregory Czap, Kyungju Noh, et al.
APS Global Physics Summit 2025
The time dependence of the zero-field-cooled and thermoremanent magnetization of the isotropic extreme type-II superconductor PbMo6S8 has been measured at temperatures 0.7T/Tc0.95 and for fields 1H300 G. The results show that the time dependence of the decay can be divided into three different field regimes: (1) A low-field regime with a closely logarithmic decay and a well-established critical state. The relaxation rate [M/ ln(t)] increases as H5 for the zero-field-cooled magnetization and as H2.4 for the thermoremanent magnetization. The reduction in magnetization over 5 decades in time (0.3"3×104 s) is, at most, a few percent. (2) A crossover-field regime with a change from a logarithmic to a nonlogarithmic decay. (3) A high-field regime where the time dependence of the decay is well described by the expression M[ln(t/0)]-. The reduction in magnetization in the crossover- and high-field regimes is as large as 25"30 % in the measured time interval. The results in the high-field regime are interpreted within the theory of collective flux creep. Comparisons are made with the magnetic relaxation found in anisotropic high-Tc superconductors. © 1991 The American Physical Society.
Gregory Czap, Kyungju Noh, et al.
APS Global Physics Summit 2025
A. Reisman, M. Berkenblit, et al.
JES
R.W. Gammon, E. Courtens, et al.
Physical Review B
Julian J. Hsieh
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films