Dresden 2006 – scientific programme

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.129: Poster

Thursday, March 30, 2006, 16:00–18:00, P1

LOCAL VIBRATIONS OF LIGHT SUBCTITUTIONAL IMPURITIES INTRODUCED INTO MICROCONTACT — •Oleksandr Kotlyar, Sergey Feodosyev, Igor Gospodarev, Vladimir Grishaev, Arnold Kosevich, and Elena Manzhelii — B.Verkin Institute for Low Temperature Physics and Engineering NAS of Ukraine, 47 Lenin ave., Kharkov Ukraine

The spectral phonon densities of light impurity atoms introduced into differ positions of microcontact are calculated by Jacoby-matrix technique. It is shown that frequencies of local vibrations (LVs) caused by availability of impurity atom near boundaries of a sample (surfaces, ribs and apexes) or in the neighborhood of the other impurities may be well described within the frames of the two-moment-model, as we called it, as well as the LVs of isolated impurity in the depth of crystal volume [1]. Therefore, for different LVs of atoms located in the non- equivalent crystal positions the frequencies of the local vibrations coincide with high precision if two first moments of their spectral densities coincide too. That is why practically full distortion of the crystal regularity in the disposition of boundary atoms does not cause merging of the discrete local levels into a single impurity zone. Out of the strip of the quasi-continuous phonon spectrum only a few very sharp peaks which are precisely separated one from another.

1.O.V.Kotlyar, S.B.Feodosyev, Low Temp. Phys, 32, N3 (2006)