Superconductor Defects (IMAGE) Brown University Caption Nanoscale defects in a superconducting material can interact with weak magnetic fields to put the brakes on superconducting electrons, new research shows. It's a demonstration of a phase change from superconducting to insulating that had been predicted in theory, but never before shown experimentally. Credit Valles Lab / Brown University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.