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RESEARCH PRODUCT
Vortex-creep activation energy in YBa2Cu3O7/PrBa2Cu3O7 superlattices
Ayman El TahanGerhard JakobH. AdrianL. Miusubject
SuperconductivityResistive touchscreenMaterials scienceCondensed matter physicsSuperlatticeEnergy Engineering and Power TechnologyActivation energyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsVortexMagnetic fieldCreepSputteringElectrical and Electronic Engineeringdescription
Abstract YBa 2 Cu 3 O 7 /PrBa 2 Cu 3 O 7 (YBCO/PBCO) superlattices with a different ratio of the superconducting and insulating layer thicknesses were prepared by high pressure dc sputtering. The vortex-creep activation energy U 0 was determined by analyzing the in-plane resistive transition of 200 μm wide bridges with the external magnetic field B oriented along the c axis. It was found that U 0 is proportional to the thickness of the YBCO layers, and does only weakly depend on the PBCO layer thickness, when the latter exceeds two unit cells. We observed a change in the variation of U 0 with the current I in the specimen: U 0 exhibits a plateau in the low- I region, then decreases significantly with increasing I . This behaviour is explained in terms of a crossover plastic vortex creep – elastic (collective) creep induced by the transport current.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-01-01 | Physica C: Superconductivity |