Magnetic relaxation in hard type-II superconductors
Abstract
Magnetic relaxation in a type-II superconductor is simulated for a range of temperatures (T) in a simple model of 2D Josephson junction array (JJA) with finite screening. The high-T phase, that is characterised by a single time scale τα, crosses over to an intermediate phase at a lower temperature Tcr wherein a second time scale τβ<<τα emerges. The relaxation in the time window set by τβ follows power law which is attributed to self-organization of the magnetic flux during relaxation. Consequently, for T<Tcr, a transition from super-critical (current density J>Jc) to sub-critical (J<Jc) state separated by an intermediate state with frozen dynamics is observed. Both τα and τβ diverges at Tsc<Tcr, marking the transition into a state with true persistent current.
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