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

We consider the effect of a magnetic field fluctuating in space and time on the transport of independent charged particles in a two-dimensional 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 weak localization expression yields an unusual effective phase breaking rate 1/tau(phi) is similar to T1/3. Our results explain the recently observed phase breaking rate in a Bi2Sr2CuO6 compound, and furnish proof for the existence of gauge fields in these materials.