ФТТ, 2008, том 50, выпуск 2

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Phonon density of states in gamma-, beta- and alpha-AgCuS

A.N.Skomorokhov, D.M.Trots\kern1pt*, I.L.Sashin\kern1pt**, H.Fuess\kern1pt*, E.L.Jadrowskii\kern1pt**, S.G.Ovchinnikov

State Scientific Center --- Institute for Physics and Power Engineering,
249033 Obninsk, Russia
* Institute for Material Science, Darmstadt University of Technology,
D-64287 Darmstadt, Germany
** Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research,
141980 Dubna, Russia
E-mail: romoks@mail.ru

(Received April 12, 2007.
In final form June 25, 2007)

This paper describes studies of ternary superionic conductor AgCuS by means of inelastic neutron scattering at temperatures from 150 to 398 K. Experimental time-of-flight spectra were recalculated into the generalized phonon density of states (G(varepsilon) ) in the frame of incoherent approximation. It is shown that G(varepsilon) of AgCuS has a nontrivial temperature dependence in the low-energy range. The relation between the temperature dependence of G(varepsilon) and existence of the LE-mode in AgCuS is discussed.

PACS: 63.20.-e, 66.10.Ed, 78.70.Nx

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