Size dependence of the Tc and the superconducting energy gap in nanocrystalline thin films of Nb

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In nanocrystalline Nb films, the superconducting Tc decreases with a reduction in the average particle size below 20nm. We correlate the decrease in Tc with a reduction in the superconducting energy gap measured by point contact spectroscopy. Consistent with the Anderson criterion, no superconducting transition was observed for sizes below 8 nm. We show that the size-dependence of the superconducting properties in this intermediate coupling Type II superconductor is governed by changes in the electronic density of states rather than by phonon softening.
pdf format 14 pages 4 figures (included)

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Superconductivity, Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/95136

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0409018
 http://arxiv.org/abs/cond-mat/0409018
 Phys. Rev. Lett. 95, 147003 (2005)
 doi:10.1103/PhysRevLett.95.147003

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