Abstract
Measurements of low temperature specific heat C p (1.5 K–25 K) have been carried out in AgI–Ag 2O–B 2O 3 superionic glasses. It has been revealed that modifications of the network coherence change the magnitude of the hump in the specific heat, which is observed when it is plotted as C p/ T 3: the increasing connectivity (defined as the number of bridging bonds per network forming ion) reduces the deviations of C p from a T 3 behavior. Finally comparative measurements of low temperature C p and low frequency Raman scattering (below 100 cm −1) in the same glass permit us to assess the frequency dependence of the photon-vibration coupling coefficient C( ω) and the spectral density of low-energy vibrational modes g( ω).
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