| Issue |
Europhys. Lett.
Volume 49, Number 4, February II 2000
|
|
|---|---|---|
| Page(s) | 494 - 500 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00176-1 | |
| Published online | 01 September 2002 | |
Magnetic relaxation in hard type-II superconductors
Department of Condensed Matter Physics and Material Sciences
Tata Institute of Fundamental Research - Colaba, Mumbai, 400 005 India
Received:
7
July
1999
Accepted:
7
December
1999
Magnetic relaxation in a type-II superconductor is simulated for a
range of temperatures T in a simple model of the 2D Josephson junction
array (JJA) with finite screening. The high-T phase, that is
characterised by a single time scale 
, crosses over to
an intermediate phase at a lower temperature Tcr wherein a second
time scale 
emerges. The relaxation in
the time window set by 
follows a power law which is
attributed to self-organization of the magnetic flux during
relaxation. Consequently, for 
, a transition from
super-critical (current density 
) to sub-critical (
)
state separated by an intermediate state with frozen dynamics is
observed. Both and diverge at
, marking the transition into a state with true
persistent current.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.60.Jg – Critical currents
© EDP Sciences, 2000
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