Applied Physics Letters · 2003 · 35 citations · 11 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsMagnetic MaterialsThin FilmsCoatingsElectrical ConductivityFerromagnetismMagnetic Properties Of SolidsSuperconducting MaterialsThin Film Electrical PropertiesCritical Current DensityHigh-temperature SuperconductorsHysteresisHysteretic BehaviorMagnetic PropertiesOxidationSuperconducting PropertiesThermal Stabilization
The development of YBa2Cu3O7−δ (YBCO)-based coated conductors for electric power applications will require electrical and thermal stabilization of the high-temperature superconducting (HTS) coating. In addition, nonmagnetic tape substrates are an important factor in order to reduce the ferromagnetic hysteresis energy loss in ac applications. We report progress toward a conductive buffer layer architecture on biaxially textured nonmagnetic Cu tapes to electrically couple the HTS layer to the underlying metal substrate. A protective Ni overlayer, followed by a single buffer layer of La0.7Sr0.3MnO3, was employed to avoid Cu diffusion and to improve oxidation resistance of the substrate. Property characterizations of YBCO films on short prototype samples revealed self-field critical current density (Jc) values exceeding 2×106 A/cm2 at 77 K and good electrical connectivity. Magnetic hysteretic loss due to Ni overlayer was also investigated.
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