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Abstract:
The measurements of anisotropic resistivities of single- and
double-layered Bi-system cuprates at different doping levels are
presented. The two types of materials exhibit qualitatively common
features in both doping and temperature dependences of their c-axis
resistivities, The c-axis conduction is incoherent in nature because the
rho(c) data are deeply on the insulating side of the Mott limit, even
though positive slopes (d rho(c)/dT>0) are observed below room
temperature for overdoped samples. Some differences are revealed by
quantifying the trend of rho(c)(T) data, which may reflect differences
in the charge excitation spectra.
