Superconductor Science and Technology · 2007 · 42 citations · 6 references
Natural SciencesMaterials EngineeringMaterials ScienceCondensed Matter PhysicsNanomaterialsSolid State PhysicsMagnetic NanomaterialsMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsStacking FaultsSuperconducting MaterialsCritical Current DensityCritical Current PerformanceCurrent DensityFlux PinningLow-temperature SuperconductorsNanomagnetismNanoparticlesPlanar Defects
The microstructure of metal-organic deposited YBa2Cu3O7−δ with dysprosium (Dy) additions has been investigated by transmission electron microscopy (TEM). Dy additions which increase the density of normal-state nanoparticles in the YBCO have been demonstrated to enhance the critical current densities in moderate magnetic fields. The influence of nanoparticles, stacking faults and other planar defects on flux pinning is discussed. We observed a high density of nanoparticles in the size range of 10–50 nm, which may act as flux pinning centres to enhance the critical current density of the material. Stacking faults and planar defects are observed which may also be effective flux pinning centres in YBCO samples with and without Dy addition.
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Crystal structure of the 80 K superconductor YBa2Cu4O8
P. Marsh, R. M. Fleming, M. L. Mandich et al. · Nature · 1988 · 337 citations