c-axis conductivity in the normal state of cuprate superconductors
  The c-axis optical conductivity and d.c. resistivity are calculated within the t-J model assuming that the interlayer hopping is incoherent. Use is made of numerical results for spectral functions recently obtained with the finite-temperature Lanczos method for finite two-dimensional systems. In the optimally doped regime we find an anomalous relaxation rate, suggesting a common relaxation mechanism for intra- and interlayer transport. At low doping a pseudo-gap opening in the density of states appears to be responsible for a semimetallic-like behavior of d.c. resistivity. 
P. Prelovsek (1 and 2), A. Ramsak (1 and 2), I. Sega (1) ((1) J.   Stefan Institute, Ljubljana, Slovenia, (2) Faculty of Mat...