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Aharonov-Bohm resistance oscillations of mesoscopic silver rings are found to be enhanced ∼ 100 times when contact to the ring is made with bismuth rather than silver or gold electrodes. An argument based on the idea that a mismatch of the Fermi surfaces at the interfaces leads to a reduced effective electrode size is shown to be inadequate, as the resistance oscillations exceed the maximum theoretical value of Altshuler, Aronov and Spivak (1991) by an order of magnitude.

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