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Report No.

Low-energy dynamics of superionic conductor AgI investigated by inelastic neutron scattering measurements

Nakamura, Mitsutaka  ; Shimakura, Hironori; Ueno, Hiroki; Kawakita, Yukinobu ; Arai, Masatoshi; Kawamura, Seiko  ; Nakajima, Kenji  ; Kikuchi, Tatsuya 

In order to elucidate the dynamical changes caused by differences in the structural phase of AgI which is a typical superionic conducting material, we carried out a detailed examination of the dynamical structure factor S(Q,E) obtained by inelastic neutron scattering measurements. Herein, we show that the intensity in a low-energy region (E $$<$$ 2 meV) at around 2 $AA$^{-1}$$ abruptly increases beyond 420 K, and the temperature-dependent behavior of this intensity is remarkably similar to that of dc ionic conductivity over a wide temperature range in the region of 420 K. A unified explanation of the ionic conduction mechanism in superionic materials may be established in terms of their characteristic low-energy excitations.



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