We have determined the first wide-range conductivity spectra of a mixed alkali glass system, extending from ${10}^{-3}\mathrm{H}\mathrm{z}$ to 1.3 THz. We report on a new mixed alkali effect in the ac conductivity that is evident even if the low-frequency contributions (linked to hopping motions of the mobile cations) are removed from the experimental spectra. From our results we conclude that the nonhopping contributions to the ac conductivity involve both the mobile ions and the glassy network.

• Received 21 April 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.266601