Structural and electrical properties of epitaxial Pb/Ag superlattices

Pb---Ag superlattices, grown epitaxially on Si(111) surfaces, are studied by reflection high energy electron diffraction, X-ray diffraction and resistivity measurements. The electron mean free path and superconducting transition temperature are determined as a function of period length. It is found that well-ordered single-crystal multilayers are formed and stable only in a limited region of period lengths.