Abstract
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.
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