Ghostly, flowing supersolid? No, it's quantum plastic - physics-math - 30 June 2010 - New Scientist

Ghostly, flowing supersolid? No, it's quantum plastic - physics-math - 30 June 2010 - New Scientist: "He concludes that the link between temperature and oscillation frequency is down to a totally new quantum effect, not supersolidity. This new effect, Reppy says, occurs due to the defects inherent in all solid helium-4, which change their behaviour at different temperatures."