Abstract
The Hall and Seebeck coefficient of (Pb(l+x)/2Cu(1−x)/2)Sr2(Y1−xCax)Cu2Oy were measured. Both Hall and Seebeck coefficient have positive values of about 6–10×10−3 cm3/C and 30–60 μV/K, respectively. The temperature dependence of the Hall coefficient and Seebeck coefficient were similar to other copper oxide superconductors such as YBa2Cu3Oy and (La,Sr)2CuO4. Namely, the Hall coefficient increases monotonously with decreasing temperature and the Seebeck coefficient has a broad peak. The quenching caused the samples to become more metallic, and the Hall and Seebeck coefficients became smaller. These results are probably due to delocalization of holes trapped in the chain sites. Therefore in the “Pb-1212” system, removing the chain site oxygen appears to be necessary for superconductivity.
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