Dependence of the phonon conductivity correction term on the relative strength of normal and umklapp processes in undoped and doped Ge in the range from 2 to 80 K

Introducing a parameter a which determines the relative strength of normal and umklapp phonon processes, the correction to phonon conductivity of undoped and doped Ge due to normal processes has been estimated in the framework of Callaway's model in the temperature range from 2 to 80 K for various values of a ranging from 0.1 to 10. There is an overall increase in the correction term with the increase in temperature, the maximum being below 10%.