SCIENCE - Material turns 'schizophrenic' on way to superconductivity

Physicists on the hunt for the origins of high-temperature superconductivity have published new findings this week about a material that becomes "schizophrenic" -- simultaneously exhibiting the characteristics of both a metallic conductor and an insulator. In a theoretical analysis, researchers offer an explanation for a strange series of observations described earlier this year by researchers at the Stanford Linear Accelerator Center in Menlo Park, Calif.

http://www.sciencedaily.com/releases/2013/04/130405104818.ht