"Giant" Aharonov-Bohm effect in mesoscopic silver rings with bismuth electrodes
Institute for Microelectronics Technology, Russian Academy of Sciences
Chernogolovka, Moscow District, 142432, Russia
2 H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
Aharonov-Bohm resistance oscillations of mesoscopic silver rings are found to be enhanced 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.
PACS: 72.15.-v – Electronic conduction in metals and alloys / 73.23.-b – Mesoscopic systems / 73.40.-c – Electronic transport in interface structures
© EDP Sciences, 1996