Flux distributions of an artificially granular YBa2Cu3O7- thin film observed using magneto-optic imaging
Artikel i vetenskaplig tidskrift, 2000

Flux distributions in a YBa2Cu3O7- thin film with artificial granularity are observed by means of magneto-optic imaging. At low magnification, flux patterns generated exclusively by the intergranular currents flowing in the intergranular area (effective medium) are directly observed. The properties of this effective medium are studied by taking flux density profiles that reveal the intergranular current density. As the observations at high magnifications show the flux penetration and pinning within the individual disks, we can identify and study the different contributions of the intergranular and intragranular current densities to the flux patterns. We show that our model sample reproduces several features observed, e.g., in Ag-sheathed (Pb,Bi)2Sr2Ca2Cu3O10+ tapes

yttrium compounds

granular structure

barium compounds

magneto-optical effects

flux pinning

high-temperature superconductors

superconducting thin films

critical current density (superconductivity)

Författare

M. R. Koblischka

L. Pust

T. H. Johansen

Bengt Nilsson

Institutionen för fysik

Tord Claeson

Institutionen för fysik

Physica C: Superconductivity and its Applications

0921-4534 (ISSN)

Vol. 331 113-26

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/S0921-4534(99)00617-6