Adsorbate-induced one-dimensional long-range modulation of an epitaxial insulator film

Ernst, W.; Eichmann, M.; Pfnu¨r, H.; Jonas, K.-L.; von Oeynhausen, V.; Meiwes-Broer, K. H.
April 2002
Applied Physics Letters;4/8/2002, Vol. 80 Issue 14, p2595
Academic Journal
Using low-energy electron diffraction and scanning tunneling micrsocopy, we found that epitaxial NaCl films grown on Ge(100) with thicknesses up to (at least) 15 monolayers can be modulated with a period of six lattice constants and an amplitude directed mainly normal to their surface. The (6×1) periodicity on the NaCl films is induced by a preadsorbed Na layer at very low coverages (Θapprox. 0.06), that form chain structures with a sixfold periodicity in one dimension. At 10 monolayers thickness of NaCl a modulation amplitude of 0.28 Å was obtained. © 2002 American Institute of Physics.


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