| Issue |
Europhys. Lett.
Volume 53, Number 5, March 2001
|
|
|---|---|---|
| Page(s) | 639 - 645 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00200-6 | |
| Published online | 01 December 2003 | |
Critical current and negative magnetoresistance of superconducting film with edge barrier
Theoretical Physics Department, Nizhny Novgorod University - Novgorod, Russia
Received:
9
February
2000
Accepted:
18
December
2000
The field-dependent critical current 
and
current-voltage characteristics are found within a generalized
critical-state model that accounts for both surface barrier and
bulk pinning as major irreversibility mechanisms in type-II
superconductors. Calculations are made for an exactly solvable
case of a thin-film superconductor taking into account the
Ginzburg-Landau nonlinearity of the order-parameter equation. The
shape of the current-voltage characteristics of the film is
determined for arbitrary magnetic field. The nonmonotonous field
dependence of the differential film resistivity is discovered,
which is characterized by a negative magnetoresistance in a
low-field region and by the Bardeen-Stephen-like behaviour in a
high-field region.
PACS: 74.60.Ec – Mixed state, critical fields, and surface sheath
© EDP Sciences, 2001
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