Terahertz Time-Domain Spectroscopic Study of Oxide Glass with Entropic Elasticity

For disordered systems, a universal excitation called the boson peak appears in the terahertz range. In this study, we performed terahertz time-domain spectroscopy on an oxide glass with entropic elasticity-mixed alkali metal metaphosphate glass with the chemical composition Li
_0.25
Na
_0.25
K
_0.25
Cs
_0.25
PO
₃
(LiNaKCsPO
₃
)-to detect the boson peak. The obtained spectra were compared with results of low-frequency Raman scattering and low-temperature specific heat measurements.