Phonon energy in an anharmonic quasi-one-dimensional solid

M.A. Grado-Caffaro , M. Grado-Caffaro

For the first time, the phonon energy per unit volume in a large anharmonic quasi-one-dimensional solid is determined by considering all polarizations of the various modes of phonon propagation and by assuming the solid as a lattice of atoms behaving as Morse oscillators. In this context, the equilibrium phonon occupation number, which is given by the Bose distribution, replaces formally the vibrational quantum number into the expression for the Morse-oscillator energy. In addition, the quasi-harmonic solid is discussed within the above framework so that the phonon energy per unit volume is calculated for a large quasi-harmonic and quasi-one-dimensional solid.

Mots clés: D. Phonon energy; D. Anharmonic solid; D. Morse oscillator; D. Bose distribution; D. Quasi-harmonic solid

Domaines: Science des matériaux [cond-mat.mtrl-sci]

M.A. Grado-Caffaro, M. Grado-Caffaro. Phonon energy in an anharmonic quasi-one-dimensional solid. Journal of Physics and Chemistry of Solids, 2011, 72 (8), pp.957. ⟨10.1016/j.jpcs.2011.05.002⟩. ⟨hal-00768587⟩