Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Nanostructures at surfaces: Dots, particles, clusters II (SPM)
O 26.3: Vortrag
Dienstag, 24. März 2009, 15:30–15:45, SCH A215
Finite size effects in isolated superconducting clusters of Pb-An STM study — Ivan Brihuega1, •Sangita Bose1, Miguel Moreno Ugeda1, 2, Christian H. Michaelis1, and Klaus Kern1,3 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart,Germany — 2Univ. Autonoma Madrid, Dept. Fis. Mat. Condensada, E-28049 Madrid, Spain. — 3Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
We report on the evolution of superconductivity in isolated Pb nano-particles grown in situ probed by Scanning tunneling spectroscopy (STS). We observe a gradual decrease of the superconducting energy gap (D) with reduction in particle size which is accompanied by a simultaneous increase in the quasiparticle lifetime broadening (G). Superconductivity gets completely destroyed at small particle sizes which are consistent with the Anderson criterion. Our results also show that for these small particles the evolution of Tc is mainly governed by the quantum size effects (QSE).