Flux penetration into an artificially granular high-Tc superconductor
Artikel i vetenskaplig tidskrift, 1999

A YBa2Cu3O7- thin film is patterned into a hexagonal close-packed lattice of disks (2r=50 m) which are touching each other at the circumferences in order to enable the flow of an intergranular current. Such a sample was suggested by Koblischka et al. [Appl. Phys. Lett. 70, 514 (1997)] as a model for a layered granular structure like in a (Pb,Bi)2Sr2Ca2Cu3O10+ (Bi-2223) tape. The magnetization measurements reveal an anomalous position of the low-field peak (central peak) similar to Bi-2223 tapes. Magneto-optic imaging is employed to visualize the local-field distributions. At low magnification, the flux patterns in the intergranular area between the disks are observed. The observations at high magnification reveal the flux penetration and pinning within the disks. It is shown that such samples may serve as model samples for granular high-Tc superconductors

barium compounds

superconducting thin films

yttrium compounds

granular structure

flux pinning

penetration depth (superconductivity)

high-temperature superconductors

flux flow

Författare

M. R. Koblishka

L. Pust

A. Galkin

P. Nalevka

M. Jirsa

T. H. Johansen

H. Bratsberg

Bengt Nilsson

Institutionen för fysik

Tord Claeson

Institutionen för fysik

Physical Review B - Condensed Matter and Materials Physics

0163-1829 (ISSN)

Vol. 59 12114-20

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.59.12114