Diamagnetic Persistent Current in Diffusive Normal-Metal Rings

E. M. Q. Jariwala, P. Mohanty, M. B. Ketchen, and R. A. Webb
Phys. Rev. Lett. 86, 1594 – Published 19 February 2001
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Abstract

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 Ecħ/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.

  • Received 9 December 1999

DOI:https://doi.org/10.1103/PhysRevLett.86.1594

©2001 American Physical Society

Authors & Affiliations

E. M. Q. Jariwala1, P. Mohanty1,*, M. B. Ketchen2, and R. A. Webb1

  • 1Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
  • 2IBM T. J. Watson Research Center, Yorktown Heights, New York 10598

  • *Present address: Dept. of Phys., Cond. Mat. Div. 114-36, California Institute of Technology, Pasadena, California 91125.

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Vol. 86, Iss. 8 — 19 February 2001

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