LOW-FREQUENCY DYNAMICS IN SUPERIONIC BORATE GLASSES BY COUPLED RAMAN AND INELASTIC NEUTRON-SCATTERING

We report a study of low-frequency vibrational dynamics and electron-vibration coupling in AgI-doped silver borate glasses, which have been shown to have anomalies which could be connected to microscopic fractality. By using both Raman scattering and time-of-flight neutron-scattering spectroscopies, we were able to determine the vibrational density of states and, for the first time in a fractal system, the frequency dependence of the electron-vibration coupling function C(). The results confirm the microscopic fractality of this system. In particular the fracton dimensionality was determined to be 1.4, and a scaling law behavior of C() was confirmed. © 1990 The American Physical Society.