Chasing the Elusive Phonon (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories researchers Jon Ihlefeld, left, and David Scrymgeour use an atomic-force microscope to examine changes in a material's phonon-scattering internal walls, before and after applying a voltage. The material scrutinized, PZT, has wide commercial uses. Credit Randy Montoya, Sandia National Laboratories Usage Restrictions media 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.