Abstract
We have investigated the contributions of CuO 2 planes and CuO chains on the transport properties of YBa 2Cu 4O 8 by measuring the electrical resistivity and thermoelectric power ( S) of Y 1− x Pr x Ba 2(Cu 1− y Zn y ) 4O 8, Y 1− x Ca x Ba 2Cu 4O 8 and YBa 2(Cu 1− x Ga x ) 4O 8. Pr reduces the mobile carrier concentration in the CuO 2 planes in YBa 2Cu 4O 8, as a consequence, the superconducting transition temperature is progressively decreased with increasing Pr. The S( T) data suggest that the metallic behavior at lower temperature of the Pr and Zn doped compounds is contributed by the double CuO chains. On the other hand, the S( T) behavior of Ca doped samples is opposite to that of the Pr doped samples because the doping of Ca in Y-site introduces holes in the CuO 2 planes. However, the substitution of Ga in Cu(1)-site suppresses the carrier concentration in CuO chains and increases the normal-state resistivity revealing the important contribution from CuO chains on the metallic behavior of YBa 2Cu 4O 8 and PrBa 2Cu 4O 8.
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