Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-01-20
J. Phys.: Condens. Matter 21, 205702 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
pdf file with figures
Scientific paper
10.1088/0953-8984/21/20/205702
The superconducting transition temperature (TC) in nanostructured Pb remains nearly constant as the particle size is reduced from 65 to 7nm, below which size the superconductivity is lost rather abruptly. In contrast, there is a large enhancement in the upper critical field (HC2) in the same size regime. We explore the origin of the unusual robustness of the TC over such a large particle size range in nanostructured Pb, by measuring the temperature dependence of the superconducting energy gap in planar tunnel junctions of Al/Al2O3/nano-Pb. We show that below 22nm, the electron phonon coupling strength increases monotonically with decreasing particle size, and almost exactly compensates for the quantum size effect, which is expected to suppress TC.
Ayyub Pushan
Banerjee Rajarshi
Bose Sangita
Chockalingam Subbaiah P.
Galande Charudatta
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