We have measured a diamagnetic persistent current with flux periodicities of both h/e and h/2e in an array of thirty diffusive mesoscopic gold rings. At the lowest temperatures, the magnitudes of the currents per ring corresponding to the h/e- and h/2e-periodic responses are both comparable to the Thouless energy Ec≡ħ/τD, where τD is the diffusion time. Taken in conjunction with earlier experiments, our results strongly challenge the conventional theories of persistent current. We consider a new approach associated with the saturation of the phase coherence time τϕ.
Published in Physical Review Letters, Volume 86, Issue 8, 2001, pages 1594-1597.
Jariwala, E.M.Q., Mohanty, P., Ketchen, M.B., and Webb, R.A. (2001). Diamagnetic Persistent Current in Diffusive Normal-Metal Rings. Physical Review Letters, 86(8), 1594-1597. doi: 10.1103/PhysRevLett.86.1594
© 2001 The American Physical Society.