Spectral distribution of activation energies in YBa2Cu3O7-delta thin films

Citation
R. Warthmann et al., Spectral distribution of activation energies in YBa2Cu3O7-delta thin films, PHYS REV B, 62(22), 2000, pp. 15226-15229
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
22
Year of publication
2000
Pages
15226 - 15229
Database
ISI
SICI code
0163-1829(200012)62:22<15226:SDOAEI>2.0.ZU;2-Z
Abstract
Local magnetic relaxation experiments are carried out on YBa2Cu3O7-delta th in films by magneto-optics. The current density is calculated quantitativel y by an inversion scheme of Blot Savart's law which gives direct informatio n about the time evolution of the current density with a high spatial resol ution of about 5 mum. We determine the local activation energies U-0(x,y) b y fitting different relaxation laws at different positions (x, y) in the fi lm plane. This analysis yields a spectral distribution of the activation en ergies that is independent of the applied model. Possible mechanisms which could lead to such a distribution are discussed.