Magnetoconductance in quantum percolation

Quantum percolation problem on 3D simple cubic lattice under influence of e xternal magnetic field is discussed. Results of numerical simulations of ma gnetoconductance and its dependence on both the system size (temperature) a nd the concentration of metallic component p are presented. Qualitative agr eement with theory for metals is obtained for large p, when the system is d elocalized. For small p, when the system is localized, the agreement with w eak localization theory predictions is successfully verified as well.