Abstract
The main results of transport studies on several series of high T c oxides in the normal state are reported. The resistivity of YBa 2(Cu 1−xZn x) 3O 7 alloys obeys Matthiessen's rule. Oxygen depletion of YBa 2Cu 3O 7 (YBCO) or doping with Co or Fe decouples the CuO 2 planes and enhances superconducting fluctuations above T c. For three materials there is a change in sign in the thermoelectric power (TEP) near to the hole concentration corresponding to maximum T c. The TEP curves of four of the more anisotropic high T c oxides are remarkably similar and therefore are characteristic of weakly coupled CuO 2 layers in the superconducting region. For oxygen depleted YBCO and the related TlPb septenary compound the Hall number decreases strongly with doping while for YBCO the Hall conductivity initially shows a much weaker variation.
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