Discovery of a 'Demon' Plasmon Unveils Secrets of Superconductors

Physicists have accidentally discovered Pines' Demon, a quantum phenomenon predicted in 1956, in the material strontium ruthenate. Pines' Demon is a type of plasmon, a discrete unit of waves among rippling electrons, and its discovery in a 3D metal has important implications for material physics. The researchers found this phenomenon while studying the material with electron spectroscopy and believe that further research on multi-band metals could provide insights into the behavior of demons and their role in superconductivity.