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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.128: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

LOCAL VIBRATIONS TRANSFORMATION INTO IMPURITY — •Sergey B. Feodosyev, Igor A. Gospodarev, Vladimir I. Grishaev, Arnold M. Kosevich, Alexandr V. Kotlyar, Vladimir O. Kruglov, Elena V. Manzhelii, and Eugenii S. Syrkin — B.Verkin Institute for Low Temperature Physics and Engineering NAS of Ukraine 47 Lenin Ave., Kharkov 61103 , UKRAINE

The phonon densities of disordered solid solutions with varied concentration of light substitutional impurity characterized by mass defect above the threshold value for formation of a local vibration are calculated by Jacoby-matrix technique. The transformation such a discrete vibration level into impurity zone with increasing impurity content is studied. It is shown that an increase of impurity concentration gives rise to broadening of basic local level accompanied by occurrence of additional peaks on the phonon density. They are attributed to the impurity configurations appeared at finite concentrations and two first moments of their spectral densities sufficiently differ from those of isolated defect. The calculations were performed for both the solutions of isotope impurity in FCC-lattice with central interaction of near neighbors, and solid solutions of aluminum in silver.