Flux trapping in hydrides not yet confirmed

Abstract

In Ref. [1], Minkov et al reported the time dependence of magnetic moment of hydride materials under high pressure in a diamond anvil cell. Here we point out that the straight lines interpolated with the measurement results give the misleading impression that thermal flux creep in superconductors decays linearly with time. To dispel this misconception, we correctly interpolated logarithmic decay curves. Then, it has become apparent that there is no reason to assume that the measured magnetic moment originates from flux trapping, i.e., there is no reason to believe that persistent currents are circulating in hydride materials under high pressure and that they are superconductors.