KOs2O6 superconductivity strongly influenced by rattling K ions, showing `2Delta(0)/kB Tc >= 4.56` coupling
Interplay of superconductivity and rattling phenomena in beta-pyrochlore KOs2O6 studied by photoemission spectroscopy.
Abstract
Beta-pyrochlore KOs2O6 exhibits strong electron-phonon coupling (2Delta(0)/kB Tc >= 4.56), with K ion rattling significantly affecting its superconductivity.