Japanese Journal of Applied Physics · 1989 · 762 citations · 6 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsMagnetic OxidesMagnetism In SolidsPhase TransitionsSuperconducting MaterialsCritical Current DensityCuprate SuperconductorsCurrent DensityHigh-temperature SuperconductivityHigh-temperature SuperconductorsQuenched PhasesSuperconducting PropertiesTemperature Gradient Effects
The authors report a new process that promises high critical current density in oxide superconductors. The process consists of three stages: rapid heating and quenching from the Y₂O₃ plus liquid region, reheating to the Y₂BaCuO₅ plus liquid region, and slow cooling with a temperature gradient in flowing oxygen to grow a unidirectionally textured YBa₂Cu₃Oₓ phase. The process produces well‑textured YBa₂Cu₃Oₓ with high Jc in magnetic fields and shows Bean’s critical state.
We report a new process which promises high critical current density in oxide superconductors. The process consists of three stages. Firstly a YBa 2 Cu 3 O x sample is rapidly heated and quenched from the Y 2 O 3 plus liquid region. Subsequently the quenched sample is reheated to the Y 2 BaCuO 5 plus liquid region, and then slowly cooled with a temperature gradient in flowing oxygen. The process enables us to grow a superconducting phase unidirectionally and to suppress the second phase intrusion, leading to the production of well textured YBa 2 Cu 3 O x which yields a high J c value in the presence of magnetic fields. It is also found that Bean's critical state is realized in such high J c samples.
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Magnetization of Hard Superconductors
C. P. Bean · Physical Review Letters · 1962 · 4.4K citations
Magnetization of Superconducting Nb-25%Zr Wire
W. A. Fietz, M. R. Beasley, J. Silcox et al. · Physical Review · 1964 · 244 citations