Second-order Raman scattering in the group-Vb semimetals: Bi, Sb, and As

J. S. Lannin, J. M. Calleja, and M. Cardona
Phys. Rev. B 12, 585 – Published 15 July 1975
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Abstract

Second-order Raman scattering has been observed in the group-Vb semimetals Bi, Sb, and As. Comparison of the spectra in Bi and Sb, which are primarily of even A1g symmetry, with neutron-scattering measurements indicate a predominance of overtone scattering. Variations in the form of the second-order spectra are attributed to differences in the phonon density of states within the group-Vb system. In contrast to Bi and Sb, the optical modes at Γ in As are shifted to relatively higher frequency so that the Eg(Γ) mode no longer occurs at the minimum of the optic branch. Differences in the vibrational spectra near Γ between As and Bi or Sb are attributed to a decrease in second- or further-neighbor interactions. From the ratio of the second- to first-order scattered intensities the corresponding ratios of average electron—one-phonon to electron—two-phonon deformation potentials are determined.

  • Received 3 March 1975

DOI:https://doi.org/10.1103/PhysRevB.12.585

©1975 American Physical Society

Authors & Affiliations

J. S. Lannin*

  • Max-Planck-Institut für Festkörperforschung, Stuttgart Federal Republic of Germany
  • Argonne National Laboratory, Argonne, Illinois 60439

J. M. Calleja and M. Cardona

  • Max-Planck-institut für Festkörperforschung, Stuttgart, Federal Republic of Germany

  • *Present address.
  • Present address: Universidad Autonoma de Madrid.

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Vol. 12, Iss. 2 — 15 July 1975

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