Journal
ACS NANO
Volume 7, Issue 5, Pages 4187-4193Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400604v
Keywords
superconductivity; nanowires; mesoporous silica matrixes; thermodynamic properties; electric transport
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Funding
- Research Grants Council of Hong Kong [SEG-HKUST03, 603010]
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We have produced ultrathin lead (Pb) nanowires in the 6 nm pores of SBA-15 mesoporous silica substrates by chemical vapor deposition. The nanowires form regular and dense arrays. We demonstrate that bulk Pb (a type-I superconductor below T-c = 7.2 K with a critical field of 800 Oe) can be tailored by nanostructuring to become a type-II superconductor with an upper critical field (H-c2) exceeding 15 T and signs of Cooper pairing 3-4 K above the bulk T-c. The material undergoes a crossover from a one-dimensional fluctuating superconducting state at high temperatures to three-dimensional long-range-ordered superconductivity in the low-temperature regime. We show with our data in an impressive way that superconductivity in elemental metals can be greatly enhanced by nanostructuring.
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