Fluctuations in the Diamagnetic Response of Disordered Metals

Abstract

We study fluctuations in the diamagnetic response of disordered mesoscopic samples. For weak magnetic fields, we derive a convenient expression for the susceptibility χ of any specific sample and show the existence of large anomalous fluctuations in χ, in agreement with other recent calculations. For strong magnetic fields, we show that the fluctuations are considerably suppressed.