In the present paper we have studied the Pb/Ge(001) system with scanning tunneling microscopy and low-energy electron diffraction. The results show that the room-temperature evolution of its interface in the course of gradual deposition of Pb consists of three stages: in the low-coverage stage Pb atoms tend to form parallel dimers on the surface; in the medium-coverage stage they tend to form Ge-dimer-like dimers on the Ge substrate; in the high-coverage stage part of the deposited Pb intermixes with Ge, forming the interfacial phase while changing the surface morphology dramaticallypart of the Pb stays on top of the surface forming some superstructures and part of the Pb (approximately half of a monolayer) mixes with Ge forming a dimer layer between the top layer and the interfacial phase. Information concerning the superstructures appearing in these stages has been collected and, as a result, a model of them has been proposed. The results of annealing have been also studied.
ASJC Scopus subject areas
- Condensed Matter Physics