Superconductivity near 35 K in aligned amorphous magnesium-doped BMgx nanowires

Cao, Limin; Zhang, Ze; Wen, Haihu; Wang, Wenkui
March 2005
Applied Physics Letters;3/21/2005, Vol. 86 Issue 12, p123113
Academic Journal
We report the superconductivity near 35 K in magnesium-doped boron nanowires, BMgx(x≈0.1), which were synthesized via the reaction of well-aligned amorphous boron nanowires with magnesium vapor in vacuum-sealed quartz tubes. Electron microscopy and electron energy-loss spectroscopy reveal that the BMgx nanowires have an amorphous structure with magnesium content of ∼10 at. %, far less than that in crystalline MgB2, and magnesium distributes uniformly in the nanowires. Our results provide a base material not only for low-temperature nanodevice applications but also for theoretical investigations on the mechanism of its superconductivity.


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