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Lattice vibrational properties of some rare-earth antimonides: Raman scattering measurements and model theory

B. RAKSHIT1,* , V. SRIVASTAVA2, S. P. SANYAL2, N. DILAWAR3, D. VARANDANI3, A. K. BANDYOPADHYAY3

Affiliation

  1. ENEA, Dipartimento Tecnologie Fisiche e Nuovi Materiali, CP 2400, 00100 Rome, Italy
  2. Computational Physics laboratory, Department of Physics Barkatullah University Bhopal, Bhopal 462026, India
  3. Vacuum and Pressure Standards, National Physics Laboratory, New Delhi 110012, India

Abstract

The lattice vibrational properties of three rare earth (RE) antimonides, namely LaSb, CeSb, and PrSb have been investigated experimentally, for the first time, using Raman Scattering technique at ambient pressure and room temperature. The experimental results show a single high intensity peak at zone center around 150 cm-1 (4.5 THz) for all the three antimonides. The experimental results have been analyzed by using breathing shell model (BSM), which includes the effect of Columb screening due to f-electron of RE ion and the breathing motion of the electron shell. The calculated phonon density of states agrees well with the measured Raman data. Calculated phonon dispersion curves for three RE antimonide compounds (LaSb, PrSb and NdSb) compare well with the available inelastic neutron scattering data. The calculated mean square displacements for these compounds show a systematic trend.

Keywords

Rare earth compounds, Electron-phonon interaction, Inelastic neutron scattering.

Citation

B. RAKSHIT, V. SRIVASTAVA, S. P. SANYAL, N. DILAWAR, D. VARANDANI, A. K. BANDYOPADHYAY, Lattice vibrational properties of some rare-earth antimonides: Raman scattering measurements and model theory, Optoelectronics and Advanced Materials - Rapid Communications, 2, 1, January 2008, pp.37-41 (2008).

Submitted at: Dec. 20, 2007

Accepted at: Jan. 16, 2008