Thermal stability of atomically flat metal nanofilms on metallic substrates |
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Authors: | F Calleja MCG Passeggi Jr R Miranda |
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Institution: | a Departamento de Física de la Materia Condensada e Instituto de Ciencia de Materiales N. Cabrera, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain b Laboratorio de Superficies e Interfases, INTEC (CONICET and UNL), S3000GLN Santa Fe, Argentina |
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Abstract: | By means of variable temperature scanning tunneling microscope we studied the morphology and electronic structure of Pb films grown on Cu(1 1 1). Due to the spatial confinement of electrons, the islands display quantized energy levels. At 300 K, Pb forms 3D nanostructures with magic heights, that correspond to islands having a quantum well state (QWS) far from the Fermi energy. Below 100 K Pb grows in a quasi-layer-by-layer fashion. The QWS that develop in the films determine their total energy and, accordingly, their thermal stability. Films of particularly magic thickness are stable upon heating to 300 K. |
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