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RESEARCH PRODUCT
Critical currents and micro-structure in YBa2Cu3O7−δ thin films
B. Stäuble-pümpinR.p. GriessenBernard DamUlrich PoppeJ.c. MartinezJ.c. MartinezR.c. SurdeanuG. Doornbossubject
Materials scienceCondensed matter physicslawAtomic force microscopyNucleationGeneral Physics and AstronomyCritical currentThin filmEpitaxyLaserMicro structureVortexlaw.inventiondescription
In an attempt to clarify the origin of the large critical current densitiesJ c observed in Laser Ablated and Sputtered YBa2Cu3O7−δ (YBCO) thin films, we make a systematic study of the low temperatureJ c in samples carefully analysed using STM and AFM.J c (B) is determined from torque-magnetometry performed in ring-patterned thin films. Epitaxial YBCO films nucleate in c-axis oriented single-crystalline islands with sizes ranging between 200 and 700 nm. We show thatJ c can be mainly explained by vortex pinning localised in the island boundaries.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-03-01 | Czechoslovak Journal of Physics |