TRANSPORT-PROPERTIES OF METALLIC CUPRATES LA(6)BALNCU(8)O(20) (LN-LANTHANIDE)

We studied transport properties of the new metallic cuptates La(6)BaLn Cu(8)O(20) (Ln:lanthanide) and their Sr-substituted materials La(6-x)S r(x)BaLnCu(8)O(20). These cuprates are metallic at room temperature an d show a slight increase in resistivity at low temperatures without su perconductivity. ?The temperature dependence of the thermoelectric pow er can be understood within a conventional theory for metals. The Hall coefficient is negative and shows a strong temperature dependence as in high-temperature superconductors. The doping dependence of the Hall coefficient suggests the presence of both hole and electron bands in this system. Characteristics of transport coefficients in La(6)BaLnCu( 8)O(20) are discussed in the light of high-temperature superconductors .