Magnetization current of a thin layer of Bi1.8Pb0.4Sr2.0Ca2.2Cu3.0Oynear silver in Ag-sheathed BSCCO-2223 tapes

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Abstract
The thin superconducting region next to the silver sheath in Ag-sheathed BSCCO-2223 tapes, which appears to be the high critical current density region was studied. Magnetic hysteresis measurements were performed on the 10 mu m thin layer of Bi1.8Pb0.4Sr2.0Ca2.2Cu3.0Oy near the silver sheath as a function of temperature, intensity, and orientation of the applied field with respect to the tape. The full penetration depth, B*, for a superconducting slab was found to have a power law dependence on temperature. Correlating the magnetic and transport measurements for the 10 mu m thin layer of Bi1.8Pb0.4Sr2.0Ca2.2Cu3.0Oy near the silver sheath showed that the 'self-field' for a transport critical current of 20 A at liquid nitrogen temperature was approximately 0.04 T. Magnetization currents as a function of temperature and applied field oriented parallel and orthogonal to the thickness dimension of the tape, Jc( mu 0Happ, T), were determined from the magnetization loop width using a Bean model expression adapted for an orthorhombic sample. Only Jc( mu 0Happ, T) values for an applied magnetic field greater than B* were calculated. Jc values that were one order of magnitude higher than those previously reported were obtained.

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