Japanese Journal of Applied Physics · 1990 · 22 citations · 5 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsElectromagnetismMagnetic MaterialsMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsSuperconducting MaterialsCritical Current DensityCritical Current PerformanceCurrent DensityElectric Field EffectsFlux CreepMagnetic Materials CharacterizationSuperconducting Critical TemperatureSuperconducting Properties
Intragrain J c values of the textured Bi- and Y-based oxides were obtained at 4.2 K–77 K by the D.C. magnetization measurements with various sweep rates of the magnetic field. The J c 's at 4.2 K were comparable for both oxides. However, with increasing temperature, the J c of the Bi-based oxide became much more sensitive to the electric field criterion E c related to the sweep rate of the magnetic field than that of the Y-based oxide. As a result, J c at 77 K of the Bi-based oxide was significantly decreased in magnetic fields for small E c . The dependence of J c on E c for both oxides can be well understood using the flux creep model.
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