SmFeAsO0.8F0.2 Wires Prepared Using Different Sheaths by the Powder-in-Tube Method
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SmFeAsO0.8F0.2 wires with composite Cu/Nb or Ta sheaths have been fabricated using an in situ powder-in-tube method. Cu diffusion into the core was observed, which led to a fuzzy boundary between the sheath and core for Cu/Nb-sheathed SmFeAsO0.8F0.2 wires, and destroyed the superconducting phase of SmFeAsO0.8F0.2. However, superconductivity has been observed in the Ta-sheathed SmFeAsO0.8F0.2 wires with T c=52.5 K. A severe weak-link effect depressed the development of global supercurrent. A peak effect with a strongly temperature-dependent peak field H peak has been observed in the J c–H curves over the range 10–40 K. The H–T phase diagram was similar to that of a previous report.
KeywordsSmFeAsO0.8F0.2 wires Superconductivity Peak effect Phase diagram
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