Figure 5: Group velocity and lattice thermal conductivity calculations.
From: Twisting phonons in complex crystals with quasi-one-dimensional substructures
(a) Calculated average group velocity components along the a and c axes as a function of energy according to the method described in Supplementary Discussion. (b) The lattice thermal conductivity along the a and c axes, as given by equation (1) with the fitted parameters stated in the text and compared with the lattice thermal conductivity of our sample. (c) The contributions to the lattice thermal conductivity from phonons and diffusons. (d) Accumulated lattice thermal conductivity at temperature 300 K from vibration modes with mean free path less than ℓ. (e) Accumulated contributions to lattice thermal conductivity at 300 K from vibrational modes with energy less than E. (f) The lattice thermal conductivity as a function of temperature for various boundary scattering mean free paths.
