Synthesis and Superconductivity in Ba-doped (Ru,Cu)(Sr,Nd)2(Nd,Ce)2Cu2Oz</s ub> Compounds

초록

We prepared various (Ru0.5Cu0.5)(Sr-1.67 (-) Ba-x(x) Nd-0.33)(Nd1.34Ce0.66)Cu2Oz samples with varying Ba contents by x = 0, 0.1, 0.2, 0.33, 0.5 and 0.835. X-ray diffraction revealed that the phase purity of the samples increases as the Ba-doping content increases and single- phase compounds could be obtained for samples with 0.1 <= x <= 0.33. Contrary to the Ba-free sample, superconductivity could be induced by partially substituting Ba for Sr and superconductivity with onset T-c of about 15 K is observed for the sample with x = 0.2. The superconducting behavior of the Ba-doped samples is discussed in conjunction with thermoelectric power measurements.

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