Bose, Sangita and Garcia-Garcia, Antonio and Ugeda, Miguel and Urbina, Juan-Diego and Michaelis, Christian and Brihuega, Ivan and Kern, Klaus (2010) Observation of shell effects in superconducting nanoparticles of Sn. Nature Materials 9, pp. 550-554.
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In a zero-dimensional superconductor, quantum size effects1, 2 (QSE) not only set the limit to superconductivity, but are also at the heart of new phenomena such as shell effects, which have been predicted to result in large enhancements of the superconducting energy gap3, 4, 5, 6. Here, we experimentally demonstrate these QSE through measurements on single, isolated Pb and Sn nanoparticles. In both systems superconductivity is ultimately quenched at sizes governed by the dominance of the quantum fluctuations of the order parameter. However, before the destruction of superconductivity, in Sn nanoparticles we observe giant oscillations in the superconducting energy gap with particle size leading to enhancements as large as 60%. These oscillations are the first experimental proof of coherent shell effects in nanoscale superconductors. Contrarily, we observe no such oscillations in the gap for Pb nanoparticles, which is ascribed to the suppression of shell effects for shorter coherence lengths. Our study paves the way to exploit QSE in boosting superconductivity in low-dimensional systems.
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter|
|Keywords:||Superconductivity, mesoscopic physics|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Partially|
|Deposited On:||28 Apr 2011 11:52|
|Last Modified:||28 Apr 2011 11:52|
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