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Lattice vibrational; phonons; dispersion curves; breathing shell model; dynamical matrix

Lattice vibrational properties of uranium pnictides have been studied using breathing shell model (BSM) which includes breathing motion of electrons of the U-atoms due tof−d hybridization. The phonon dispersion curves of U-pnicitides calculated from the present model agree reasonably well with the measured data. A comparison has been made between BSM and our results reported earlier obtained from three-body force rigid ion model to reveal the importance of the short-range electron-phonon interactions in these compounds. We also report, for the first time, the two phonon density of states and specific heat for these compounds.

Prafulla K Jha¹ Sankar P Sanyal¹

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

Published

January 1994

Manuscript received

20 July 1993

Manuscript revised

15 November 1993