Design and Development of Ag-Sheathed Bi-Based High-Tc Superconducting Wires with Low AC Losses by Introducing Oxide Resistive Barriers

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The aim of this study is development of Ag-sheathed Bi-based (Bi2223) high-Tc superconducting wires with low-AC loss by introducing interfilamentary oxide resistive barriers. In order to suppress the side effect on the phase formation and properties of Bi2223 superconductor, Ca2CuO3 (CCO) and SrZrO3 (SZO) were selected as barrier materials. From the examination of transport properties and transverse matrix resistivity, SZO was found to be more effective to suppress the deterioration of critical current density (Jc) and also to suppress the interfilamentary electromagnetic coupling under an AC external field. Finally, Jc around 20 kAcm-2 at 77 K and self-field and coupling frequency fc of 270 Hz at 77 K and AC external field perpendicular to the broader face of tape could be achieved simultaneously. According to these achievements, perpendicular field losses around 50 Hz for barrier tape were 70-80% lower than those for conventional 4 mm-width tape with fully coupled filaments.