Volume 76, Number 3, November 2006
|Page(s)||498 - 504|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||22 September 2006|
Quantum-size effects on Tc in superconducting nanofilms
Departement Fysica, Universiteit Antwerpen - Groenenborgerlaan 171 B-2020 Antwerpen, Belgium
2 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research 141980 Dubna, Russia
Accepted: 1 September 2006
An essential property of a high-quality metallic nanofilm is the quantization of the electron spectrum due to dimensional confinement in one direction. Quantum confinement has a substantial impact on the superconducting characteristics and leads to quantum-size variations of the critical temperature Tc with film thickness. We demonstrate that the Bogoliubov-de Gennes equations are able to describe the thickness-dependent Tc in nanofilms, and our results are in good agreement with recent experimental data on flat terraces grown on silicon (Science, 306 (2004) 1915 and Nature Phys., 2 (2006) 173). We predict that the quantum-size oscillations of will be more pronounced for .
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 74.78.Na – Mesoscopic and nanoscale systems / 74.62.-c – Transition temperature variations
© EDP Sciences, 2006
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