Abstract
Neutron inelastic scattering of the copper-ion conductor CuI is measured bythe time-of-flight (TOF) method at 35, 200, 280 and 360°C. The neutron inelastic spectra are analyzed by the use of a model function for the generalized density of states. This model function consists of two components: a low-energy excitation mode and phonon modes due to the transverse acoustic branch. The value of the dispersionless low-energy excitation ℏω∼3.4 meV is almost independent of temperature. The relation between the excitation energy and the mass of the cations can be represented by ℏω∼( 1 M ) 1 2 . The relation could also be described as a cation plasma model with an appropriate effective charge of the cation.
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