On creep of trapped flux near Tc in MgB2 and CaKFe4As4

We present flux creep data taken at different temperatures on single crystals of known, ambient pressure, superconductors, CaKFe4As4 and MgB2, taken using the protocol that is common for trapped flux measurements. Using our results, we show that the time dependence of the magnetic moment in H3S is remarkably similar to the magnetization relaxation rates observed in established superconductors at ambient pressure, where in the latter cases this can be unambiguously assigned to flux creep.