Physics of the Solid State
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Effect of atomic mass and isotopic disorder on the phonon spectra of isotope-enriched germanium crystals
Kotereva T.V.
1, Gavva V.A.
1, Lipsky V.A.1, Nezhdanov A.V.
2, Plotnichenko V.G.3, Bulanov A.D.
1,2
1Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhny Novgorod, Russia
2Lobachevsky State University, Nizhny Novgorod, Russia
3Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, Russia
2Lobachevsky State University, Nizhny Novgorod, Russia
3Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, Russia
Email: kotereva@ihps-nnov.ru
Studied the influence of average atomic mass and isotopic disorder on the phonon spectra of lattice IR absorption and Raman scattering (RS) for single crystals of germanium isotopes 72Ge, 74Ge and 73Ge in comparison with 72Ge0.574Ge0.5. At a temperature of 15 K, differences in the width and position of the two-phonon absorption bands in the IR spectra were observed for the monocrystalline germanium 72Ge0.574Ge0.5 and 73Ge. In the first- and second-order RS spectra, a shift of phonon frequencies to the higher frequency region was found, associated with a decrease in the average atomic mass of germanium single crystals. Keywords: Elemental semiconductors, stable germanium isotopes, isotopic effects, Raman scattering, IR absorption.
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