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The superconducting critical temperature (=Tc) in the Ru1−xSnxSr2GdCu2O8 has a maximum at ∼48K for x=0.2. So we synthesized the compound in which Gd3+ was partially replaced with Ca2+ expecting Tc higher than one of RuSr2GdCu2O8. The procedure (annealing temperature, times and mixing process) used to synthesize Ru0.8Sn0.2Sr2Gd1−yCayCu2O8 for Cay (y=0, 0.01, 0.03) was slightly different from one applied...
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