Abstract
The half-height M of magnetic hysteresis loops in superconductors (directly related to the induced critical current) is larger for larger rates of sweep, B=dBext/dt, of the external magnetic induction, Bext. If the flux-line (FL) motion is determined only by thermally activated flux creep then the induced magnetization M, increases linearly with the logarithm of B. In this paper, the author analyses another mechanism affecting the distribution of FL due to viscous forces. This mechanism yields a linear increase of M with B. Measurements on YBaCuO single crystals initially show a close to logarithmic dependence (corresponding to the dominant flux creep mechanism of FL motion), but the dependence turns towards higher values of M at higher speeds of FL motion. This deviation can be partly attributed to viscous forces in a moving FL lattice.
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