C-AXIS RESISTIVITY DUE TO TRANSPORT OF FERMIONIC PAIRS IN THE CUPRATES

With the assumption of complete incoherence of single electron transpo rt along the c-axis, it is argued that it takes place by coherent hopp ing of singlet pairs that are fermionic in character. This will lead t o a correction to the 1/T c-axis resistivity calculated by Anderson et al.(6) The c-axis resistivity coming from this extra channel of trans port is shown to have the same temperature dependence as the inplane r esistivity (linear in T) and mildly sensitive to the inplane carrier c oncentration through the modification of the density of states at the fermi surface. It is argued that the resistivity due to transport in t his extra channel will be very sensitive to the c-axis disorder and sh ow an upturn at low temperatures due to c-axis disorder and scattering by acoustic phonons.