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Physics news on the Internet (based on electronic preprints)

Nanotubes. P Sheng and his colleagues at the Hong Kong University of Science and Technology have for the first time detected intrinsic superconductivity in carbon nanotubes below a temperature of 20 K. Nanotubes possess unique electrical and mechanical properties and are hollow microscopic cylinders with walls just one carbon atom thick (see Usp. Fiz. Nauk 167 945 (1997) [Phys. Usp. 40 899 (1997) ] ). Previously, physicists had seen only the so-called `weak superconductivity', due to the tunneling effect in nanotubes placed in a narrow gap between two superconductors. In the Hong Kong experiment, three intrinsic superconductivity effects Ð supercurrent, the Meissner effect, and the energy gap Ð were observed in nanotubes. Source: Science 292 2462 (2001); www.science.com