Pressure-temperature anomalies of doped ZnO polycrystalline films deposited on bare glasses

A sharp-like modulation of the linear electrooptics coefficient (LEC) versu s the pressure (p) and the temperature (T) was observed for the first time for the ZnO crystalline films doped by F. We have unambiguously demonstrate d that the observed effect is caused by incorporation of the F atoms and is absent in the pure ZnO crystallines. Norm-conserving self-consistent pseud opotential and molecular dynamics simulations independently reproduce these modulations and attribute them to the electron-phonon interactions (EPI). Contribution of the inter-cluster tunneling is demonstrated. (C) 2001 Elsev ier Science B.V. All rights reserved.