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Temperature dependent thermoelectric power (TEP) data on Ba(Fe1-xTMx)2As2 (TM= Co and Cu), complemented by the Hall coefficient data on the samples from thesame batches, have been measured. For Co-doping we clearly see a change in thetemperature dependent TEP and Hall coefficient data when the sample is doped tosufficient $e$ (the number of extra electrons associated with the TM doping) soas to stabilize low temperature superconductivity. Remarkably, a similar changeis found in the Cu-doped samples at comparable e-value, even though thesecompounds do not superconduct. These changes possibly point to a significantmodification of the Fermi surface / band structure of Ba(Fe1-xTM_x)2As2 atsmall electron doping, that in the case of Co-doping is just before, andprobably allows for, the onset of superconductivity. These data further suggestthat suppression of the structural / magnetic phase transition and theestablishment of a proper e-value are each necessary but, individually, notsufficient conditions for superconductivity.

Thermoelectric power and Hall coefficient measurements on Ba(Fe(1-x)TMx)2As2 (TM = Co and Cu)