Fig. 3: Phonon dispersions of CuP2.
From: Dimer rattling mode induced low thermal conductivity in an excellent acoustic conductor
a The phonon dispersion obtained at the time-of-flight neutron spectrometer-Pelican along [H, H, H] direction of Brillouin zone G = (111). The circles are the corresponding results obtained from the triple-axis spectrometer—Taipan. The orange lines are the calculated dispersions. b Calculated phonon dispersions of Brillouin zones G = (200), G = (022), and G = (111). The size of the shadow bubbles represents the magnitude of Grüneisen parameter (γ) of the related branches. c–h Phonon dispersions of G = (200), G = (022), and G = (111) Brillouin zones collected at Taipan. The circles are the phonon energies determined by the spectral fitting to a Lorentzian function. The red dashed lines represent the linear fitting of phonon branches approaching the Brillouin zone centers to determine the sound speeds.
