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"Giant" Enhancement of the Upper Critical Field and Fluctuations above the Bulk Tc in Superconducting Ultrathin Lead Nanowire Arrays

Authors He, Mingquan HKUST affiliated (currently or previously)
Wong, Chi Ho HKUST affiliated (currently or previously)
Tse, Pok Lam HKUST affiliated (currently or previously)
Zheng, Yuan HKUST affiliated (currently or previously)
Zhang, Haijing HKUST affiliated (currently or previously)
Lam, Frank Leung Yuk HKUST affiliated (currently or previously)
Sheng, Ping View this author's profile
Hu, Xijun View this author's profile
Lortz, Rolf Walter View this author's profile
Issue Date 2013
Source ACS Nano , v. 7, (5), May 2013, p. 4187-4193
Summary 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 Tc = 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 (Hc2) exceeding 15 T and signs of Cooper pairing 3-4 K above the bulk Tc. 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. © 2013 American Chemical Society.
ISSN 1936-0851
Language English
Format Article
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