Measurement of Selected Phonons in Rubidium as a Function of Temperature and Volume

Abstract

The first measurements of phonon frequencies in a metal as a function of temperature, at constant values of the atomic volume, are reported. The $\left[\zeta 00\right]\mathrm{T}$, $\zeta =0.2\mathrm{}$ mode exhibits considerable temperature dependence at constant volume, whereas modes in the $\left[\zeta 00\right]\mathrm{L}$, $\left[\zeta \zeta 0\right]\mathrm{L}$, and $\left[\zeta \zeta 0\right]\mathrm{T}1$ branches show little such dependence. The mode Grüneisen parameters are also determined.