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Pis'ma v Zh. Èksper. Teoret. Fiz., 2008, Volume 88, Issue 7, Pages 531–533 (Mi jetpl245)  

CONDENSED MATTER

Normal and “Anomalous” isotope shifts of phonon frequencies in mono- and polyisotopic germanium crystals

V. P. Glazkova, A. S. Ivanovb, I. Kuldab, V. I. Ozhogina, V. A. Somenkova

a Russian Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182, Russia
b Institut Laue-Langevin, Grenoble, France

Abstract: The shifts of the phonon frequencies in 70Ge and 74Ge monoisotopic crystals have been studied using inelastic neutron scattering. It has been shown that the frequency shifts for all of the branches are normal, i.e., inversely proportional to √M. At the same time, the gap between acoustic and optical frequencies in monoisotopic crystals appears to be much wider (by about 2 meV in the [111] direction) than that in natural polyisotopic crystals containing “isotopic defects.” In this case, the phonon frequencies undergo “anomalous” shifts; i.e., the oscillation frequency of the heavier isotope is higher than that for the lighter isotope. The effect is in qualitative agreement with old theoretical calculations of the effect of mass defects on the phonon spectra of diatomic lattices.

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English version:
Journal of Experimental and Theoretical Physics Letters, 2008, 88:7, 458–460

Bibliographic databases:

Document Type: Article
PACS: 61.72.uf, 62.30.+d, 63.20.-e, 63.20.D-
Received: 26.06.2008
Revised: 20.08.2008

Citation: V. P. Glazkov, A. S. Ivanov, I. Kulda, V. I. Ozhogin, V. A. Somenkov, “Normal and “Anomalous” isotope shifts of phonon frequencies in mono- and polyisotopic germanium crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 88:7 (2008), 531–533; JETP Letters, 88:7 (2008), 458–460

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  • Письма в Журнал экспериментальной и теоретической физики Pis'ma v Zhurnal Иksperimental'noi i Teoreticheskoi Fiziki
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