TRANSPORT PHENOMENA NEAR THE MOTT TRANSITION

We consider the transport properties of a strongly (antiferromagnetically) correlated electron system in the temperature regime where the Fermi-liquid coherence ceases to exist. We find that the resistivity is linear in temperature, the thermal conductivity is almost temperature independent obeying approximately the Wiedemann-Franz law, while the Hall coefficient acquires a temperature dependence. The sign of the thermopower and Hall coefficient are hole-like. We calculate the residual resistivity caused by a random potential using the slave-boson technique. The disorder changes the slope of the temperature-dependent resistivity, but the Fermi surface remains relatively sharp. © 1990 The American Physical Society.