A new type of metallic state of matter has been discovered by an international team of researchers studying a superconductor made from carbon-60 molecules or buckyballs. The team found the new state after changing the distance between neighbouring buckyballs by doping the material with rubidium. The study reveals that the material has a rich combination of insulating, magnetic, metallic and superconducting phases – including the hitherto unknown state, which the researchers have dub a Jahn–Teller metal.

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