MOLECULAR-BEAM EPITAXY OF CDF2 LAYERS ON CAF2(111) AND SI(111)

Cadmium fluoride single crystal layers have been grown on CaF2/Si(111) or Si(111) substrates by molecular beam epitaxy. The structures are e xpected to have attractive electronic properties. The growth was monit ored by reflections high energy electron diffraction (RHEED) technique s. A distinct (square-root 3 X square-root 3) R30-degrees superstructu re has been observed on the CdF2(111) surface at growth temperatures b elow 150-degrees-C. RHEED intensity oscillations indicate a two-dimens ional growth mode of CdF2.