Abstract
Significant reduction of microwave surface resistance, R s in single layer Y 0.98Ca 0.02Ba 2Cu 3O z thin films on annealed MgO substrates has been observed. At low temperature, R s of best Y 0.98Ca 0.02Ba 2Cu 3O z film (0.1 mΩ at 20 K, 22 GHz) was nearly three times lower compared to that of YBa 2Cu 3O z film (0.35 mΩ at 20 K, 22 GHz). The enhanced critical current density ( J c) value below 60 K in both self as well as large applied field for Y 0.98Ca 0.02Ba 2Cu 3O z film and hence the much improved microwave performance below 60 K firmly supports the improved superconducting order parameters near the grain boundaries. A strong depression of J c in other than Ca 2% substituted films even with small applied field has been noticed.
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