Electrodynamics of granular aluminum from superconductor to insulator: Observation of collective superconducting modes
Electrodynamics of granular aluminum from superconductor to insulator: Observation of collective superconducting modes
We report on a detailed study of the optical response and ${T}_{c}\text{\ensuremath{-}}\ensuremath{\rho}$ phase diagram (${T}_{c}$ being the superconducting critical temperature and $\ensuremath{\rho}$ the normal state resistivity of the film) of granular aluminum, combining transport measurements and a high resolution optical spectroscopy technique. The ${T}_{c}\text{\ensuremath{-}}\ensuremath{\rho}$ phase diagram is discussed as resulting …