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We have successfully synthesized a new superconductor EuSr2Cu2Ta1−xSnxO8−y of the so-called Ta-1212 system, where Ta is substituted for Cu(1) in the Y-123 type structure and holes are doped into the CuO2 plane through the partial substitution of Sn4+ for Ta5+. The superconducting transition temperature, Tc, is about 40K at x=0.2. This is the first superconductor in the Ta-1212 system.
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