6533b851fe1ef96bd12a969d
RESEARCH PRODUCT
Inhibition of the detrimental double vortex-kink formation in thick YBa2Cu3O7films with BaZrO3nanorods
L. MiuGerhard JakobA. CrisanI. IvanDana MiuPaolo Melesubject
Materials scienceCondensed matter physicsMetals and AlloysNanotechnologyActivation energyCondensed Matter PhysicsVortexMagnetic fieldCondensed Matter::Materials ScienceMagnetizationCondensed Matter::SuperconductivityMaterials ChemistryCeramics and CompositesNanorodCuprateNanodotElectrical and Electronic EngineeringCurrent densitydescription
We investigated the temperature (T) variation of the normalized magnetization relaxation rate S and of the corresponding normalized vortex-creep activation energy U* = T/S for YBa2Cu3O7 films containing BaZrO3 nanorods, with the external magnetic field H oriented perpendicular to the film surface. It was found that by increasing the film thickness and using nanodot decorated substrates the high-T S(T) maximum appearing at low H is substituted by a minimum in S(T). As revealed by the analysis of the current density dependence of U*, this behaviour is due to the inhibition of vortex excitations involving double vortex-kinks and superkinks formation in the investigated thick films, owing to the large nanorod splay and pinning energy dispersion.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-03-07 | Superconductor Science and Technology |