Abstract
Tl-1223 has potential as a practical superconductor for use at the temperature of liquid nitrogen because of strong pinning behavior and an attractive T c of 120 K. In this study, we investigated the transport properties of granular Tl-1223 tape-shaped wire in magnetic fields and compared them with properties of Y- and Bi-based tapes. It was found that the transport properties of Tl-1223 tape in a magnetic field are well explained by the granular superconductor model of Peterson and Ekin [Phys. Rev. B 37 (1988) 9848], and are similar to those of the Y-123 tape. The effective junction thickness of Tl-1223 is improved to 1/10 that of Y-123. The weak-link behavior of Tl-1223 tape-shaped wire is discussed.
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