Phys. Rev. Lett. 86, 1594–1597 (2001)Diamagnetic Persistent Current in Diffusive Normal-Metal RingsReceived 9 December 1999; published in the issue dated 19 February 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.1594
DOI:
10.1103/PhysRevLett.86.1594
PACS:
73.23.Ra, 05.40.-a, 73.50.Mx
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