TRANSITION FROM STRANSKI-KRASTANOV TO QUASI-LAYER-BY-LAYER GROWTH IN PB DEPOSITION ON CU(100)

The fast, epitaxial deposition of Pb films on Cu(100) was monitored by helium atom beam scattering over the substrate temperature range of 1 50-400 K. A growth mode transition from Stranski-Krastanov to quasi-la yer-by-layer growth was observed by decreasing the deposition temperat ure. From 150 to 180 K, intensity oscillations of the specularly refle cted helium beam show a complex modulated pattern which is interpreted as due to the concurrent influence of transition in growth mode and s tructure and of quantum size effects in the overlayer electronic state s. From low-energy electron diffraction observations, it was found tha t Pb grows along [111] direction with two domains rotated 90-degrees w ith respect to each other at temperatures from 150 to 218 K.