dV/dI double peak structures in superlattice-based tunnel junctions.

摘要

We realized high quality tunnel junctions using bcc-bcc Mo-Ta superlattices in the modulation wavelength range 16--450 (angstrom) as the first electrode. The dV/dI vs. V characteristics showed a double peak structure in the wavelength range 50--250 (angstrom). We fitted the temperature behavior of these structures using both a two band model and the proximity effect theory. Preliminary calculations of a possible microscopic explanation of this data are presented. 8 refs., 4 figs.