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Phonon dispersion curves; density of states; rare earth; intermediate valence compounds

We report for the first time the complete phonon dispersion curves for the ytterbium pnictide compounds (YbN, YbP and YbAs) using a breathing shell model to establish their predominant ionic nature. The calculated results also show that this group of rare earth compounds does not show any elastic and phonon anomalies which are the characteristic features of other rare earth compounds. We emphasize the need for further Raman and neutron scattering measurements.

Prafulla K Jha¹ Sankar P Sanyal¹

1. Department of Physics, University of Bhopal, C V Raman Building, Bhopal - 462 026, India

Published

May 1995

Manuscript received

17 January 1995