Superconducting Properties of Ag and Sb Substitution on Low-Density YBa2Cu3O δ Superconductor
The effects of silver (Ag) and antimony (Sb) substitution on low-density YBa2Cu3O δ (YBCO) superconductor were investigated. Two series of sample with a nominal composition of YBa2−x Ag x Cu3O δ and YBa2−x Sb x Cu3O δ where x=0.05, 0.10, 0.15, 0.20, 0.30, 0.40 and 0.50 were synthesized and characterized. All Ag-doped samples showed metallic behavior at the normal state and T C onset was found at 90 K. T C zero decreased as the Ag concentration increased. Optimum Ag concentration was achieved at x=0.20 where T C zero has the highest value of 87 K and J C at 70 K is 16.50 A/cm2. For Sb-doped case with x≤0.30, the samples showed metallic behavior above T C onset while semiconducting behavior was shown for x≥0.40. The optimum Sb concentration was achieved at x=0.15 where T C zero is 85 K and J C value measured at 70 K is 2.75 A/cm2. T C onset and T C zero were found to decrease toward higher Sb concentration. The crystallographic structure transformed to tetragonal in Sb-doped samples of x≥0.30 while other samples remain orthorhombic.
KeywordsSuperconductor YBCO Ag-doped Sb-doped
The authors wish to thank the Ministry of Higher Education (MOHE) Malaysia through Exploratory Research Grant Scheme (ERGS) for the financial support.
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