Applied Physics Letters · 1988 · 168 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsMetallic MaterialsCurie TemperatureFerromagnetismMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsSurface MagnetismCritical Current DensityCritical Current PerformanceCurrent DensityFlux PinningOxide MagnetismRare-earth MagnetismRare-earth OxidesVortex Pinning
Samples of YBa2 Cu3Ox doped with silver oxide (Tc ∼93 K) have exhibited attractive forces in gradient magnetic fields, both normal and tangential to the surfaces, which are more than twice the sample weight. This allows sample suspension below a rare earth magnet. Critical current density was increased by ∼102 at 77 K. Persistent fields, flux pinning, magnetization, and modeling are described.