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Low energy vibrational excitations characteristic of superionic glass

Nakamura, Mitsutaka   ; Iwase, Hiroki; Arai, Masatoshi; Kartini, E.*; Russina, M.*; Yokoo, Tetsuya*; Taylor, J. W.*

The mechanism of high ionic conductivity in superionic glass constitute an unsolved problem in the field of science.Here we performed inelastic neutron scattering measurements of superionic glass system (AgI)$$_{x}$$(Ag$$_{2}$$S)$$_{x}$$(AgPO$$_{3}$$)$$_{1-2x}$$ by using MARI spectrometer at ISIS, and found that the $$Q$$-dependence of inelastic intensity in the energy region from 1 to 3 meV of superionic phase glass shows an excess intensity above $$Q$$=1.8$AA$^{-1}$$ compared with insulator phase one. Similar phenomena were also observed in another superionic glass (AgI)$$_{0.5}$$(AgPO$$_{3}$$)$$_{0.5}$$ by using NEAT spectrometer at HMI with high resolution measurement. These results clearly suggest peculiar low energy vibrational excitations should be universal features of superionic glass.



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Category:Physics, Condensed Matter



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