Pseudogap effects on the normal state transport in copper oxide materials

Within the framework of the fermion-spin theory, the normal state transport property of copper oxide materials in the underdoped regime is studied bas ed on the t-J model. It is shown that there is a common relaxation mechanis m for the in-plane and c-axis transport, i.e., the in-plane and c-axis tran sport properties are mainly governed by the scattering from the in-plane fl uctuation, which would be suppressed when the holon pseudogap opens at low temperatures, leading to the temperature linear to the nonlinear range in t he in-plane resistivity and crossovers to the semiconducting-like range in the c-axis resistivity.