Phys. Rev. Lett. 64, 2074–2077 (1990)Magnetization of mesoscopic copper rings: Evidence for persistent currentsReceived 26 January 1990; published in the issue dated 23 April 1990 We have measured the low-temperature magnetization response of 107 isolated mesoscopic copper rings to a slowly varying magnetic flux. At sufficiently low temperature, the total magnetization response oscillates as a function of the enclosed magnetic flux on the scale of half of a flux quantum. The amplitude of the oscillatory moment is ≊1.2×10-15 Am2 and decreases exponentially with increasing temperature on the scale of the correlation energy Ec=hD/(2L)2≊80 mK. This is evidence for a flux-periodic persistent current in each ring of average value 3×10-3eνF/L. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.2074
DOI:
10.1103/PhysRevLett.64.2074
PACS:
73.60.Aq, 03.65.Bz, 05.30.Ch
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