We obtain bcc-bcc Mo-Ta superlattices in the modulation wavelength range 16 450 A. The x-ray analysis shows long structural coherence even in the short-modulation-wavelength limit, and the resistivity data are in the metallic regime. We find the universal behavior of the Tc versus curve already seen in other metals, compounds, and alloys and, for superlattices in the range 50 250 A the dV/dI versus V characteristics show a double-peak structure. The temperature behavior of these peaks is fitted by a two-band model and by a proximity-effect theory.
ASJC Scopus subject areas
- Condensed Matter Physics