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Clusters challenge common sense

Clusters challenge common sense

Astronomers have long known that an isolated gravitational system, such as a star, has a negative heat capacity: when energy is added it expands and cools. Now Hellmut Haberland and co-workers at the University of Freiburg in Germany have demonstrated a more down-to-earth example. Recently they have shown that an isolated cluster of 147 sodium […]

Read article: New metallic superconductor makes an immediate impact

New metallic superconductor makes an immediate impact

Superconductivity – the complete loss of electrical resistance in certain metals when cooled to low temperatures – continues to hold surprises. Hot on the heels of the discovery of charge-induced superconductivity at 50 K on the surface of carbon-60 molecules late last year comes the discovery of bulk superconductivity at temperatures approaching 40 K in magnesium diboride. […]

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