WEAK-LOCALIZATION OF CHARGED QUANTUM PARTICLES IN A DISORDERED SYSTEMSUBJECT TO A STRONGLY FLUCTUATING MAGNETIC-FIELD

We consider the effect of a magnetic field fluctuating in space and ti me on the transport of independent charged particles in a two-dimensio nal random potential. The renormalization of the diffusion coefficient and the destruction of phase coherence by the magnetic field lead to a finite quantum correction to the electrical conductivity deltasigma at finite temperature T. Comparison of our result with the standard we ak localization expression yields an unusual effective phase breaking rate 1/tau(phi) is similar to T1/3. Our results explain the recently o bserved phase breaking rate in a Bi2Sr2CuO6 compound, and furnish proo f for the existence of gauge fields in these materials.