LONGITUDINAL AND TRANSVERSE DISSIPATION IN A SIMPLE-MODEL FOR THE VORTEX LATTICE WITH SCREENING

Transport properties of the vortex lattice in high-temperature superco nductors are studied using numerical simulations in the case in which the nonlocal interactions between vortex lines are dismissed. The resu lts obtained for the longitudinal and transverse resistivities in the presence of quenched disorder are compared with the results of experim ental measurements and other numerical simulations where the full inte raction is considered. For all but highly anisotropic samples the qual itative agreement obtained indicates that the transport characteristic s of the vortex structure in real materials are mainly a consequence o f the topological configuration of the vortex structure only. In addit ion, for highly anisotropic samples, a regime is obtained where longit udinal dissipation appears at temperatures where transverse dissipatio n is still vanishingly small. I discuss the possibility of observing t his regime in real samples.