schematic of electron density in Eu-1144 (IMAGE) DOE/Brookhaven National Laboratory Caption In this illustration of the superconducting material Eu-1144, the blue and magenta wave shown above the crystal lattice represents how the energy level of the electron pairs (yellow spheres) spatially modulates as these electrons move through the crystal. Credit Brookhaven National Laboratory Usage Restrictions OK for use in stories about this research License Original 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.