Kondo Droplet (IMAGE) University of Illinois Chicago Caption Cobalt atoms (red) are placed on a copper surface (green) one at a time to form a Kondo droplet, leading to a collective pattern that is the fundamental building block of superconductivity. Credit Dirk Morr 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.